Archive for the ‘Space’ Category

The Nativity According to Matthew

December 20, 2018
The Adoration of the Magi (circa 1305) by Giot...

The Adoration of the Magi

 

Matthew begins his Gospel with the genealogy of Jesus. I’ll skip the genealogy and go straight to his account of Jesus’s birth.

 

18 This is how the birth of Jesus the Messiah came about: His mother Mary was pledged to be married to Joseph, but before they came together, she was found to be pregnant through the Holy Spirit. 19 Because Joseph her husband was faithful to the law, and yetdid not want to expose her to public disgrace, he had in mind to divorce her quietly.

20 But after he had considered this, an angel of the Lord appeared to him in a dream and said, “Joseph son of David, do not be afraid to take Mary home as your wife, because what is conceived in her is from the Holy Spirit. 21 She will give birth to a son, and you are to give him the name Jesus, because he will save his people from their sins.”

22 All this took place to fulfill what the Lord had said through the prophet: 23 “The virgin will conceive and give birth to a son, and they will call him Immanuel” (which means “God with us”).

24 When Joseph woke up, he did what the angel of the Lord had commanded him and took Mary home as his wife. 25 But he did not consummate their marriage until she gave birth to a son. And he gave him the name Jesus.

After Jesus was born in Bethlehem in Judea, during the time of King Herod, Magi from the east came to Jerusalem and asked, “Where is the one who has been born king of the Jews? We saw his star when it rose and have come to worship him.”

When King Herod heard this he was disturbed, and all Jerusalem with him. When he had called together all the people’s chief priests and teachers of the law, he asked them where the Messiah was to be born. “In Bethlehem in Judea,” they replied, “for this is what the prophet has written:

“‘But you, Bethlehem, in the land of Judah,
are by no means least among the rulers of Judah;
for out of you will come a ruler
who will shepherd my people Israel.’

Then Herod called the Magi secretly and found out from them the exact time the star had appeared. He sent them to Bethlehem and said, “Go and search carefully for the child. As soon as you find him, report to me, so that I too may go and worship him.”

After they had heard the king, they went on their way, and the star they had seen when it rose went ahead of them until it stopped over the place where the child was. 10 When they saw the star, they were overjoyed. 11 On coming to the house, they saw the child with his mother Mary, and they bowed down and worshiped him. Then they opened their treasures and presented him with gifts of gold, frankincense and myrrh. 12 And having been warned in a dream not to go back to Herod, they returned to their country by another route.

13 When they had gone, an angel of the Lord appeared to Joseph in a dream. “Get up,” he said, “take the child and his mother and escape to Egypt. Stay there until I tell you, for Herod is going to search for the child to kill him.”

14 So he got up, took the child and his mother during the night and left for Egypt, 15 where he stayed until the death of Herod. And so was fulfilled what the Lord had said through the prophet: “Out of Egypt I called my son.”

16 When Herod realized that he had been outwitted by the Magi, he was furious, and he gave orders to kill all the boys in Bethlehem and its vicinity who were two years old and under, in accordance with the time he had learned from the Magi. 17 Then what was said through the prophet Jeremiah was fulfilled:

18 “A voice is heard in Ramah,
weeping and great mourning,
Rachel weeping for her children
and refusing to be comforted,
because they are no more.”

19 After Herod died, an angel of the Lord appeared in a dream to Joseph in Egypt 20 and said, “Get up, take the child and his mother and go to the land of Israel, for those who were trying to take the child’s life are dead.” (Matthew 1:18-2:20)

 

Most people think that the slaughter of the baby boys in Bethlehem involved the murder of hundreds or thousands of innocents. Remember, though, that Bethlehem was a small village in this time with a likely population of a few hundred. It is doubtful that more than half a dozen children were killed, not enough to make it into any other sources we have for Herod’s rule. Herod was certainly ruthless enough to order such a massacre. He had no trouble killing members of his own family if he thought they threatened his rule. In fact, Herod being an Idumean (or Edomite) and not a Jew, was a foreigner and so was as despised by many Judeans as a Roman governor would have been. If he had heard that there was a potential rival to his throne, even a child, that the Jews might rally around, he would have wasted no time in disposing of that rival.

 

The word Magi usually refers to Zoroastrian priests. In Greco-Roman usage the term Magi had connotations of magicians or sorsorers, exotic figures from distant lands. It is not clear just who the Magi actually were. They may indeed have been Zoroastrians. The references to the Star of Bethlehem suggest that they may have been astrologers. The Babylonians had a reputation for being skilled in astrology and magic so the Magi may have come from Mesopotamia. They may also have been Jewish since they were seeking for a king of the Jews. The fact that they were unfamiliar with the prophets may prove that they were Gentiles. The number of the Magi is not given in the Gospel. The reason that three are usually pictured  is that there were three gifts; gold, frankincense,and myrrh.

 

It is also not clear just what the Star of Bethlehem actually was. There have been several theories presented, but none of them are entirely satisfactory. The star might have been a supernova, perhaps in a nearby galaxy. There is no way to know for certain since any supernova remnant so far away would be difficult, perhaps impossible, to detect. It might also have been a comet. This is rather unlikely. Although a comet would behave much as the star is said to behave, hanging in the sky over a certain location for several nights, comets were universally perceived as being harbingers of disaster in ancient, and not so ancient, times. The most likely explanation is a conjunction of the planets Jupiter and Saturn. The astronomer Keppler discovered that there was indeed such a conjunction in the year 7 BC. The following year there was another conjunction of Mars, Jupiter, and Saturn. This might have been very impressive to the Magi. It may also be that the Star was a supernatural phenomonem and one that cannot be studied today. Whatever the truth of the matter is, I hope everyone has a wonderful Christmas.

 

 

 

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Cloud City on Venus

November 13, 2018

With a surface temperature hot enough to melt lead, Venus would not seem to be a candidate for manned exploration, but NASA seems to think otherwise, if this article in the Daily Mail is any indication.

Popular science fiction of the early 20th century depicted Venus as some kind of wonderland of pleasantly warm temperatures, forests, swamps and even dinosaurs.

In 1950, the Hayden Planetarium at the American Natural History Museum were soliciting reservations for the first space tourism mission, well before the modern era of Blue Origins, SpaceX and Virgin Galactic.

All you had to do was supply your address and tick the box for your preferred destination, which included Venus.

Today, Venus is unlikely to be a dream destination for aspiring space tourists.

As revealed by numerous missions in the last few decades, rather than being a paradise, the planet is a hellish world of infernal temperatures, a corrosive toxic atmosphere and crushing pressures at the surface.

Despite this, NASA is currently working on a conceptual manned mission to Venus, named the High Altitude Venus Operational Concept – (HAVOC).

But how is such a mission even possible? Temperatures on the planet’s surface (about 460°C) are in fact hotter than Mercury, even though Venus is roughly double the distance from the sun.

This is higher than the melting point of many metals including bismuth and lead, which may even fall as ‘snow’ onto the higher mountain peaks.

The surface is a barren rocky landscape consisting of vast plains of basaltic rock dotted with volcanic features, and several continent-scale mountainous regions.

It is also geologically young, having undergone catastrophic resurfacing events.

Such extreme events are caused by the build up of heat below the surface, eventually causing it to melt, release heat and re-solidify.

Certainly a scary prospect for any visitors.

Luckily, the idea behind NASA’s new mission is not to land people on the inhospitable surface, but to use the dense atmosphere as a base for exploration.

No actual date for a HAVOC type mission has been publicly announced yet.

This mission is a long term plan and will rely on small test missions to be successful first.

Such a mission is actually possible, right now, with current technology. The plan is to use airships which can stay aloft in the upper atmosphere for extended periods of time.

As surprising as it may seem, the upper atmosphere of Venus is the most Earth-like location in the solar system.

Between altitudes of 50km and 60km, the pressure and temperature can be compared to regions of the Earth’s lower atmosphere.

The atmospheric pressure in the Venusian atmosphere at 55 km is about half that of the pressure at sea level on Earth.

In fact you would be fine without a pressure suit, as this is roughly equivalent to the air pressure you would encounter at the summit of Mount Kilimanjaro. Nor would you need to insulate yourself as the temperature here ranges between 20°C and 30°C.

The atmosphere above this altitude is also dense enough to protect astronauts from ionising radiation from space.

 

HAVOC

 

The greatest disappointment of this space age in which we have learned so much about the planets is that not only is there no life on the other planets but they are all so hostile to life that manned exploration and colonization is going to be much more difficult than the science fiction writers of an earlier age could have imagines. Venus is not the swampy world with dinosaurs they imagined, but a literal inferno. Mars is not the home of an ancient civilization that may be planning to conquer Earth to rejuvenate their dying planet but a small, cold world with a very thin atmosphere. Even other solar systems do not offer much hope. Hot Jupiters seem to be the rule rather than the exception. It is safe to say that the Earth wouldn’t exist it there were a Jupiter in Mercury’s orbit. Nice Earthlike planets seem to be rather rare, though Earth sized planets are not easy to detect.

Well, if it were easy, it wouldn’t worth doing and the fact that colonizing the other planets is more difficult than we might have thought only adds to the glory once we have done it. We really need to establish humanity on other planets. It is never a good idea to carry all one’s eggs in one basket. The sooner we can spread ourselves far and wide across the universe, the better the chances of the long term survival of the species.

I think we ought to take the idea of a floating base for exploration a couple of steps further. Why not floating cities in the atmosphere of Venus? I can imagine a time in which there will be thousands or even millions of people living and working among the clouds of Venus. Perhaps they will be working on terraforming Venus, lowering the planet’s temperature and altering its atmosphere to something breathable. Maybe someday Venus really will be a tropical paradise. In the meantime, living in the clouds will do.

Future Venus colony

 

Personally, though, I’d rather live on Mars.

The Nativity According to Matthew

December 20, 2017
The Adoration of the Magi (circa 1305) by Giot...

The Adoration of the Magi

 

Matthew begins his Gospel with the genealogy of Jesus. I’ll skip the genealogy and go straight to his account of Jesus’s birth.

 

18 This is how the birth of Jesus the Messiah came about: His mother Mary was pledged to be married to Joseph, but before they came together, she was found to be pregnant through the Holy Spirit. 19 Because Joseph her husband was faithful to the law, and yetdid not want to expose her to public disgrace, he had in mind to divorce her quietly.

20 But after he had considered this, an angel of the Lord appeared to him in a dream and said, “Joseph son of David, do not be afraid to take Mary home as your wife, because what is conceived in her is from the Holy Spirit. 21 She will give birth to a son, and you are to give him the name Jesus, because he will save his people from their sins.”

22 All this took place to fulfill what the Lord had said through the prophet: 23 “The virgin will conceive and give birth to a son, and they will call him Immanuel” (which means “God with us”).

24 When Joseph woke up, he did what the angel of the Lord had commanded him and took Mary home as his wife. 25 But he did not consummate their marriage until she gave birth to a son. And he gave him the name Jesus.

After Jesus was born in Bethlehem in Judea, during the time of King Herod, Magi from the east came to Jerusalem and asked, “Where is the one who has been born king of the Jews? We saw his star when it rose and have come to worship him.”

When King Herod heard this he was disturbed, and all Jerusalem with him. When he had called together all the people’s chief priests and teachers of the law, he asked them where the Messiah was to be born. “In Bethlehem in Judea,” they replied, “for this is what the prophet has written:

“‘But you, Bethlehem, in the land of Judah,
are by no means least among the rulers of Judah;
for out of you will come a ruler
who will shepherd my people Israel.’

Then Herod called the Magi secretly and found out from them the exact time the star had appeared. He sent them to Bethlehem and said, “Go and search carefully for the child. As soon as you find him, report to me, so that I too may go and worship him.”

After they had heard the king, they went on their way, and the star they had seen when it rose went ahead of them until it stopped over the place where the child was. 10 When they saw the star, they were overjoyed. 11 On coming to the house, they saw the child with his mother Mary, and they bowed down and worshiped him. Then they opened their treasures and presented him with gifts of gold, frankincense and myrrh. 12 And having been warned in a dream not to go back to Herod, they returned to their country by another route.

13 When they had gone, an angel of the Lord appeared to Joseph in a dream. “Get up,” he said, “take the child and his mother and escape to Egypt. Stay there until I tell you, for Herod is going to search for the child to kill him.”

14 So he got up, took the child and his mother during the night and left for Egypt, 15 where he stayed until the death of Herod. And so was fulfilled what the Lord had said through the prophet: “Out of Egypt I called my son.”

16 When Herod realized that he had been outwitted by the Magi, he was furious, and he gave orders to kill all the boys in Bethlehem and its vicinity who were two years old and under, in accordance with the time he had learned from the Magi. 17 Then what was said through the prophet Jeremiah was fulfilled:

18 “A voice is heard in Ramah,
weeping and great mourning,
Rachel weeping for her children
and refusing to be comforted,
because they are no more.”

19 After Herod died, an angel of the Lord appeared in a dream to Joseph in Egypt 20 and said, “Get up, take the child and his mother and go to the land of Israel, for those who were trying to take the child’s life are dead.” (Matthew 1:18-2:20)

 

Most people think that the slaughter of the baby boys in Bethlehem involved the murder of hundreds or thousands of innocents. Remember, though, that Bethlehem was a small village in this time with a likely population of a few hundred. It is doubtful that more than half a dozen children were killed, not enough to make it into any other sources we have for Herod’s rule. Herod was certainly ruthless enough to order such a massacre. He had no trouble killing members of his own family if he thought they threatened his rule. In fact, Herod being an Idumean (or Edomite) and not a Jew, was a foreigner and so was as despised by many Judeans as a Roman governor would have been. If he had heard that there was a potential rival to his throne, even a child, that the Jews might rally around, he would have wasted no time in disposing of that rival.

 

The word Magi usually refers to Zoroastrian priests. In Greco-Roman usage the term Magi had connotations of magicians or sorsorers, exotic figures from distant lands. It is not clear just who the Magi actually were. They may indeed have been Zoroastrians. The references to the Star of Bethlehem suggest that they may have been astrologers. The Babylonians had a reputation for being skilled in astrology and magic so the Magi may have come from Mesopotamia. They may also have been Jewish since they were seeking for a king of the Jews. The fact that they were unfamiliar with the prophets may prove that they were Gentiles. The number of the Magi is not given in the Gospel. The reason that three are usually pictured  is that there were three gifts; gold, frankincense,and myrrh.

 

It is also not clear just what the Star of Bethlehem actually was. There have been several theories presented, but none of them are entirely satisfactory. The star might have been a supernova, perhaps in a nearby galaxy. There is no way to know for certain since any supernova remnant so far away would be difficult, perhaps impossible, to detect. It might also have been a comet. This is rather unlikely. Although a comet would behave much as the star is said to behave, hanging in the sky over a certain location for several nights, comets were universally perceived as being harbingers of disaster in ancient, and not so ancient, times. The most likely explanation is a conjunction of the planets Jupiter and Saturn. The astronomer Keppler discovered that there was indeed such a conjunction in the year 7 BC. The following year there was another conjunction of Mars, Jupiter, and Saturn. This might have been very impressive to the Magi. It may also be that the Star was a supernatural phenomonem and one that cannot be studied today. Whatever the truth of the matter is, I hope everyone has a wonderful Christmas.

 

 

 

The Nativity According to Matthew

December 21, 2016
The Adoration of the Magi (circa 1305) by Giot...

The Adoration of the Magi

 

Matthew begins his Gospel with the genealogy of Jesus. I’ll skip the genealogy and go straight to his account of Jesus’s birth.

 

18 This is how the birth of Jesus the Messiah came about: His mother Mary was pledged to be married to Joseph, but before they came together, she was found to be pregnant through the Holy Spirit. 19 Because Joseph her husband was faithful to the law, and yetdid not want to expose her to public disgrace, he had in mind to divorce her quietly.

20 But after he had considered this, an angel of the Lord appeared to him in a dream and said, “Joseph son of David, do not be afraid to take Mary home as your wife, because what is conceived in her is from the Holy Spirit. 21 She will give birth to a son, and you are to give him the name Jesus, because he will save his people from their sins.”

22 All this took place to fulfill what the Lord had said through the prophet: 23 “The virgin will conceive and give birth to a son, and they will call him Immanuel” (which means “God with us”).

24 When Joseph woke up, he did what the angel of the Lord had commanded him and took Mary home as his wife. 25 But he did not consummate their marriage until she gave birth to a son. And he gave him the name Jesus.

After Jesus was born in Bethlehem in Judea, during the time of King Herod, Magi from the east came to Jerusalem and asked, “Where is the one who has been born king of the Jews? We saw his star when it rose and have come to worship him.”

When King Herod heard this he was disturbed, and all Jerusalem with him. When he had called together all the people’s chief priests and teachers of the law, he asked them where the Messiah was to be born. “In Bethlehem in Judea,” they replied, “for this is what the prophet has written:

“‘But you, Bethlehem, in the land of Judah,
are by no means least among the rulers of Judah;
for out of you will come a ruler
who will shepherd my people Israel.’

Then Herod called the Magi secretly and found out from them the exact time the star had appeared. He sent them to Bethlehem and said, “Go and search carefully for the child. As soon as you find him, report to me, so that I too may go and worship him.”

After they had heard the king, they went on their way, and the star they had seen when it rose went ahead of them until it stopped over the place where the child was. 10 When they saw the star, they were overjoyed. 11 On coming to the house, they saw the child with his mother Mary, and they bowed down and worshiped him. Then they opened their treasures and presented him with gifts of gold, frankincense and myrrh. 12 And having been warned in a dream not to go back to Herod, they returned to their country by another route.

13 When they had gone, an angel of the Lord appeared to Joseph in a dream. “Get up,” he said, “take the child and his mother and escape to Egypt. Stay there until I tell you, for Herod is going to search for the child to kill him.”

14 So he got up, took the child and his mother during the night and left for Egypt, 15 where he stayed until the death of Herod. And so was fulfilled what the Lord had said through the prophet: “Out of Egypt I called my son.”

16 When Herod realized that he had been outwitted by the Magi, he was furious, and he gave orders to kill all the boys in Bethlehem and its vicinity who were two years old and under, in accordance with the time he had learned from the Magi. 17 Then what was said through the prophet Jeremiah was fulfilled:

18 “A voice is heard in Ramah,
weeping and great mourning,
Rachel weeping for her children
and refusing to be comforted,
because they are no more.”

19 After Herod died, an angel of the Lord appeared in a dream to Joseph in Egypt 20 and said, “Get up, take the child and his mother and go to the land of Israel, for those who were trying to take the child’s life are dead.” (Matthew 1:18-2:20)

 

Most people think that the slaughter of the baby boys in Bethlehem involved the murder of hundreds or thousands of innocents. Remember, though, that Bethlehem was a small village in this time with a likely population of a few hundred. It is doubtful that more than half a dozen children were killed, not enough to make it into any other sources we have for Herod’s rule. Herod was certainly ruthless enough to order such a massacre. He had no trouble killing members of his own family if he thought they threatened his rule. In fact, Herod being an Idumean (or Edomite) and not a Jew, was a foreigner and so was as despised by many Judeans as a Roman governor would have been. If he had heard that there was a potential rival to his throne, even a child, that the Jews might rally around, he would have wasted no time in disposing of that rival.

 

The word Magi usually refers to Zoroastrian priests. In Greco-Roman usage the term Magi had connotations of magicians or sorcerers, exotic figures from distant lands. It is not clear just who the Magi in the Gospel actually were. They may indeed have been Zoroastrians. The references to the Star of Bethlehem suggest that they may have been astrologers. The Babylonians had a reputation for being skilled in astrology and magic so the Magi may have come from Mesopotamia. They may also have been Jewish since they were seeking for a king of the Jews. The fact that they were unfamiliar with the prophets may prove that they were Gentiles. The number of the Magi is not given in the Gospel. The reason that three are usually pictured  is that there were three gifts; gold, frankincense,and myrrh.

 

It is also not clear just what the Star of Bethlehem actually was. There have been several theories presented, but none of them are entirely satisfactory. The star might have been a supernova, perhaps in a nearby galaxy. There is no way to know for certain since any supernova remnant so far away would be difficult, perhaps impossible, to detect. It might also have been a comet. This is rather unlikely. Although a comet would behave much as the star is said to behave, hanging in the sky over a certain location for several nights, comets were universally perceived as being harbingers of disaster in ancient, and not so ancient, times. The most likely explanation is a conjunction of the planets Jupiter and Saturn. The astronomer Kepler discovered that there was indeed such a conjunction in the year 7 BC. The following year there was another conjunction of Mars, Jupiter, and Saturn. This might have been very impressive to the Magi. It may also be that the Star was a supernatural phenomenon and one that cannot be studied today. Whatever the truth of the matter is, I hope everyone has a wonderful Christmas.

 

 

 

Basidium

July 8, 2016

My favorite books when I was in the fifth and sixth grades were the Mushroom Planet books by Eleanor Cameron. These books were published back in the 1950’s and so were a little before my time, but fortunately the school library didn’t have a lot of new books. I must have checked out each of the books hundreds of times.

The Mushroom Planet, Basidium, was Earth’s second moon, a small asteroid orbiting just 50,000 miles away. Although only an asteroid, Basidium is made of a dense substance called Brumblium so it is able to retain an atmosphere and support life. The predominant form of life on Basidium is various forms of mosses and fungi, particularly tree sized mushrooms, hence the name Mushroom Planet. Even the inhabitants of Basidium are mushroom people, though they are humanoid in appearance.

Mushroom People

Mushroom People

Because Basidium is made of Brumblium, it cannot be detected by telescope without a special filter invented by Tyco M. Bass, himself a member of a race of terrestrial Mushroom people called the Mycetians, descendants of Basidiumites who perhaps travelled to Earth in the form of spores. In “the first book, “The Wonderful Flight to the Mushroom Planet“, Mr. Bass, with the help of his two young friends David Topman and Chuck Masterson builds a spaceship for the two boys to travel to Basidium and save the natives from a threat to their existence. In later books in the series, Chuck and Dave return to Basidium with a stowaway, meet Tyco Bass’s cousin Theo, and have other adventures.

Tyco Bass

It was a bit silly, I suppose, and the science is woefully out of date, but I really enjoyed reading them and always wished that I could meet Mr. Bass and travel to the Mushroom Planet. For that matter, I still like the books today, though I haven’t actually read them for many years. Too bad there isn’t really a second moon orbiting the Earth, or is there? According to this article in phys.org, maybe there is at least a “quasi-moon”.

A small asteroid has been discovered in an orbit around the sun that keeps it as a constant companion of Earth, and it will remain so for centuries to come.

As it orbits the , this new asteroid, designated 2016 HO3, appears to circle around Earth as well. It is too distant to be considered a true satellite of our planet, but it is the best and most stable example to date of a near-Earth companion, or “quasi-satellite.”

“Since 2016 HO3 loops around our planet, but never ventures very far away as we both go around the sun, we refer to it as a quasi-satellite of Earth,” said Paul Chodas, manager of NASA’s Center for Near-Earth Object (NEO) Studies at the Jet Propulsion Laboratory in Pasadena, California. “One other asteroid—2003 YN107—followed a similar orbital pattern for a while over 10 years ago, but it has since departed our vicinity. This new asteroid is much more locked onto us. Our calculations indicate 2016 HO3 has been a stable quasi-satellite of Earth for almost a century, and it will continue to follow this pattern as Earth’s companion for centuries to come.”

In its yearly trek around the sun, asteroid 2016 HO3 spends about half of the time closer to the sun than Earth and passes ahead of our planet, and about half of the time farther away, causing it to fall behind. Its orbit is also tilted a little, causing it to bob up and then down once each year through Earth’s orbital plane. In effect, this small asteroid is caught in a game of leap frog with Earth that will last for hundreds of years.

The asteroid’s orbit also undergoes a slow, back-and-forth twist over multiple decades. “The asteroid’s loops around Earth drift a little ahead or behind from year to year, but when they drift too far forward or backward, Earth’s gravity is just strong enough to reverse the drift and hold onto the asteroid so that it never wanders farther away than about 100 times the distance of the moon,” said Chodas. “The same effect also prevents the asteroid from approaching much closer than about 38 times the distance of the moon. In effect, this small asteroid is caught in a little dance with Earth.”

Asteroid 2016 HO3 was first spotted on April 27, 2016, by the Pan-STARRS 1 asteroid survey telescope on Haleakala, Hawaii, operated by the University of Hawaii’s Institute for Astronomy and funded by NASA’s Planetary Defense Coordination Office. The size of this object has not yet been firmly established, but it is likely larger than 120 feet (40 meters) and smaller than 300 feet (100 meters).

There is no indications that there are any mushroom people in HO3. Too bad. I guess I won’t be meeting the Great Ta, the king of Basidium and his foolish wise men, Mebe and Oru.

Great Ta and his wise men

Great Ta and his wise men

Growing Crops on Mars

June 27, 2016

We may have already a taken a step towards the colonization of Mars. Any colony on Mars whether a permanent settlement or a long-term scientific research expedition will have to be largely self-sufficient because of the long travel time from Earth. At the very least, humans living on Mars for any great length of time will have to be able to get food and water on Mars, if possible. Obviously, given Mars’s thin atmosphere, it will not be possible to plant fields of crops out in the open, but it may be possible to create domed habitations in which vegetables can be grown. This would be a lot easier if Martian soil could be used or modified since bringing soil from Earth, or hydroponic equipment would likely be prohibitively expensive.

Mars

It is not clear whether terrestrial plants can grow in Martian soil, given the lack of organic matter and different chemical composition. There is some encouraging news from The Netherlands in this article in phys.org.

Dutch scientists said Thursday crops of four vegetables and cereals grown on soil similar to that on Mars have been found safe to eat, amid plans for the first manned mission to the planet.

Abundant harvests of radishes, peas, rye and tomatoes all grown on the soil were found to contain “no dangerous levels” of heavy metals, said the team from Wageningen University in the Netherlands.

“These remarkable results are very promising,” said senior ecologist Wieger Wamelink.

“We can actually eat the radishes, peas, rye and tomatoes, and I am very curious what they will taste like.”

Future Mars settlers will have to take food supplies with them and then plant crops in order to survive.

So using soil developed by NASA to resemble that of the red planet, the university has been experimenting since 2013 and has managed to raise 10 crops.

But uncertainty remains about whether they would absorb the high levels of heavy metals such cadmium, copper and lead, present in Mars soil.

Further tests are now needed on the remaining six crops, including potatoes, in research which is being backed by a crowd-funding campaign.

NASA plans a manned trip to Mars within the next 10 to 15 years or so, and similar projects are also being pursued by US billionaire Elon Musk and the Dutch company Mars One, tentatively aiming to set up human colonies on the Red Planet.

The Mars One project has backed the Wageningen experiments and is currently undertaking a third selection to whittle down the remaining 100 candidates hoping to be among their astronauts to 40.

“It’s important to test as many crops as possible, to make sure that settlers on Mars have access to a broad variety of different food sources,” said Wamelink.

When I read the headline, I thought that they had grown the vegetables and grains in actual Martian soil samples and I was a little disappointed to learn that the soil used was Earth soil made to simulate Martian soil. It does show that it is at least possible to use Martian soil, though I think it would be better to obtain actual Martian soil to be sure. No matter how well designed our probes are, there is always a possibility that we have overlooked something that could be only be discovered by human beings in laboratories on Earth.

If the members of a Martian expedition do grow their own food, they will need to bring along bacteria from Earth to add the necessary organic components to make the soil more Earth-like. Such bacteria could be genetically modified to flourish in Martian conditions. No form of terrestrial life can survive on the surface of Mars, at present, the thin atmosphere cannot shield the surface from deadly ultraviolet radiation, but there is no reason Terran life couldn’t survive underground. Conditions wouldn’t that much worse than in Antarctica. This bacteria, adapted for Mars could be the first step in terraforming Mars for human habitation.

So, when can I leave for Mars?

One of these days, I'd like to look out my window and see this.

One of these days, I’d like to look out my window and see this.

Beware the Ides of March

March 15, 2016

That is what a soothsayer says to Julius Caesar in Shakespeare’s play. Caesar had reason to be wary of that particular date since that was the day the conspirators planned to assassinate him. Caesar ignored the warning, either out of fatalism or foolhardiness, and his assassination began the course of events that led to the rise of his grand-nephew Augustus and the end of the Roman Republic.

But what are the ides anyway? The Roman calendar was somewhat complicated and was reformed several times in the history of the Republic, until Julius Caesar straighten things out with his Julian calendar. Originally, the Roman calendar seems to have been a lunar calendar with the months corresponding to the lunar cycle. Thus each month began with the New Moon. The Romans did not count days from the beginning of the month, as we do, but instead counted before and after certain key days perhaps corresponding with the phases of the moon. The first day of the month corresponding with the new moon was called the Kalends, from which our word calendar is derived. The ides of the month was the day in the middle of the month, corresponding to the full moon. The ides was either on the thirteenth or fifteenth day depending on whether the month was a long or short one. The nones was eight days before the ides and corresponds to the half moon or first quarter. I would think that they would also make the third quarter of the moon one of the special days but it doesn’t seem to have been.

The day before the kalends, nones, or ides was referred to as the pridie, or the day before in Latin. So, yesterday, March 14, was pridie ides March. Other dates were simply counted back from the nearest reference day. So March 12 would be the the fourth day, ( the reference days were counted) before the ides of March, or a.d. (ante diem) IV id March. March 2 was six days before the nones or a. d VI non. March 25 would be 8 days before the kalends of April, or a. d. VIII kal. This seems to be a rather cumbersome system, having to remember how many days between the kalends and ides, etc, but I suppose the Romans were used to it, and maybe it wasn’t much worse than having to remember which months have thirty or thirty-one days. I’m glad we don’t do that though.

In any case, today is the Ides of March, so if you happen to be Julius Caesar, watch out.

Leap Day 2016

February 29, 2016

Since today, a leap day, occurs only once every four years, I thought I might like to write a little about why we have leap years and where the idea originated. Our calendar ultimately comes from the calendar used by the Romans. The names of the months and the number of days in each month are basically the same, though the year originally began in March and the Romans did not count the days from the beginning of the month but counted backwards from three fixed days, the kalends, the nones, and the ides.

The Roman calendar was, like many ancient calendars, a lunisolar calendar with a intercalary month added at intervals to keep the dates aligned with the seasons. The responsibility for inserting the intercalary month lay with the Pontifex Maximus, the leader of the order of Priests called the Pontiffs. (One of the titles of the Pope is the Pontiff.) Unfortunately this position was a political one and the Pontiffs got in the habit of inserting the extra month to prolong the terms of their political allies, or not inserting it if their enemies were in office. By the time of Julius Caesar the date was three months behind the seasons.

In 46 BC, Caesar returned to Rome from Egypt. The Egyptians had long used a solar calendar of 365 days. Caesar brought mathematicians and astronomers from  Alexandria with him and he directed them to reform the Roman calendar. The calendar they developed is called the Julian Calender. In this new calendar, they changed the first month to January and gave each month the number of days it now contains. Most importantly, they did away with the intercalary months altogether. The Julian calendar was to be solely a solar calendar and the months would have no relation to the moon. Caesar lengthened the year 46 BC to 445 days to bring the date back in alignment with the seasons. This year was called the year of confusion, but it was the last year of confusion as the Julian calendar was adopted throughout the Roman world and is used with some modifications to this day.

The most important reform the Greek astronomers made was the introduction of the Leap Year. The problem is that the year is not exactly 365 days. Instead, as the astronomers had learned, the year is closed to 365 1/4 days. So, it seemed that an easy way to keep the date aligned was to simply add a day every four years. And so, since Caesar’s reform of the calendar, we have had leap years every four years.

Have We Found Aliens?

January 25, 2016

It is just barely possible that we have discovered the first evidence for some sort of extraterrestrial intelligence. At any rate, astronomers have discovered a star that is something of an anomaly, according to this article.

Three months ago, news broke that a giant “alien megastructure” could exist around a bizarre-looking star 1,500 light-years away.

While the prospect of aliens was first launched by Penn State astronomer Jason Wright, almost everyone in the astronomy community agreed that the chances that this was the case were “very low.

Now, the latest investigations into this strange star by Louisiana State University astronomerBradley Schaefer have reignited the alien theory, New Scientist reported.

What makes this star, KIC8462852, so bizarre is the drastic changes in light we see from it over time. Many stars experience temporary fluctuations in brightness, increasing and decreasing in luminosity over time, but KIC8462852’s changes are severe by comparison.

Astronomers refer to stars that experience those fluctuations in luminosity as variable stars. A star can change in brightness either because something occasionally blocks the star’s light, usually a companion star or perhaps a planet, or because the internal processes of the star cause variations in luminosity. Probably every star is at least a little variable. The Sun has its eleven year sunspot cycle, for example. Whether the cause of a star’s variability is external or internal, its cycle of variability tends to be regular. That does not seem to be the case with KIC8462852.

Between 2009 and 2013, astronomers using the Kepler space telescope discovered that it would sometimes lose up to 20% of its brightness. What’s more, the changes didn’t follow any obvious pattern.

That would suggest something gigantic must be blocking the light at random times, meaning that it couldn’t be a planet or other regular orbiting object because that would generate a distinct pattern of dimming light. It must be something that changes shape over time, thereby blocking different levels of light at random intervals.

Could the cause be artificial?

An alien megastructure, called a Dyson swarm, was suggested as one explanation for what scientists have observed, but the most likely reason astronomers came up with was comets — a giant family of them.

But Shaefer says not so fast.

“The comet-family idea was reasonably put forth as the best of the proposals, even while acknowledging that they all were a poor lot,” Schaefer told New Scientist. “But now we have a refutation of the idea, and indeed, of all published ideas.”

To make his discovery, Schaefer had to dig deep down into the astronomy archives at Harvard. It turns out, astronomers have data on KIC8462852 dating back as far as 1890.

By analyzing over 1,200 measurements of this star’s brightness taken from 1890 through 1989, Schaefer found that the irregular dimming of KIC8462852 has been going on for over 100 years. Schaefer published his findings in the online preprint server arXiv.org.

What’s more, he explains in his paper that this “century-long dimming trend requires an estimated 648,000 giant comets (each with 200 km diameter) all orchestrated to pass in front of the star within the last century,” which he said is “completely implausible.”

By killing the comet theory, Schaefer has brought us one step closer to finding out what is really happening around KIC8462852.

At the same time, he’s also reignited the possibility that the source could be an alien megastructure that an advanced alien civilization has been slowly building over time. One thing’s certain for Schaefer: The bizarre dimmings are probably caused by a single, physical mechanism that’s undergoing some type of ongoing change.

“The century-long dimming and the day-long dips are both just extreme ends of a spectrum of timescales for unique dimming events, so by Ockham’s Razor, all this is produced by one physical mechanism,” Shaefer said in his paper. “This one mechanism does not appear as any isolated catastrophic event in the last century, but rather must be some ongoing process with continuous effects.”

Schaefer isn’t the only one interested in learning more about KIC8462852. Late last year, astronomer Doug Vakoch and his team at the new organization called SETI (Search for Extraterrestrial Intelligence) International — not to be confused with the SETI Institute — went hunting for aliens around KIC8462852.

They searched for signals that an alien civilization might be beaming toward Earth either in radio or visible wavelengths, but ultimately they came up empty handed. So, if it is aliens, then they’re being awfully quiet.

Is it aliens? If this is some structure created by an extraterrestrial civilization, we shouldn’t expect to be receiving any sort of messages from them. They would have no reason to believe that there is any intelligent life here on Earth since any radio waves we have emitted cannot be farther than about 100 light years away by now. Any message to or from KIC8462582 would take 1500 years to reach its destination. They may have sent a message last year but we won’t get it for a long time.

I tend to think, however, that the explanation for the strange behavior of KIC8462582 will turn out to be due to an entirely natural phenomenon.I think that as we begin to explore the universe we will find that life is fairly common. The elements and compounds that make up the basic components of life are found throughout the universe and if the current understanding of the earliest history of the Earth is accurate, it seems that life arose on this planet as soon as it was physically possible. Scientists do not know precisely how life began on Earth, but I think that they will find that where ever the right conditions are found, there will be life of some sort. I think, though, that most of the life we find in the universe is going to be simple and primitive, some equivalent of terrestrial bacteria. Bacteria were the only form of life found on Earth for most of its history. Intelligent life must be still rarer. Human beings have only been around much less than 1% of the Earth’s history and we have only had to capability to communicate by radio for a little over a century. There doesn’t seem to be any reason to believe that the development of intelligent life or a technological civilization was inevitable and considering the strange twists and turns of the history of life it  may not be very probable. I think then, that we will find some few worlds with alien plants or animals, but that we are probably the only intelligent form of life in our galaxy.

Even if there are extraterrestrial civilizations, our relations with them will not be like Star Wars or Star Trek in which there are a number of different races at about the same level of technology. It is more likely that if two civilizations make contact, one civilization will be millions of years ahead of the other. Any space wars are likely to be short and decisive with the more advanced civilization quickly overcoming the more primitive. With that in mind, maybe we shouldn’t be trying to draw attention to ourselves. I would hate to think that there is a fleet of conquistadors from KIC8462852 heading this way.

The Nativity According to Matthew

December 21, 2015

 

Matthew begins his Gospel with the genealogy of Jesus. I’ll skip the genealogy and go straight to his account of Jesus’s birth.

 

18 This is how the birth of Jesus the Messiah came about: His mother Mary was pledged to be married to Joseph, but before they came together, she was found to be pregnant through the Holy Spirit. 19 Because Joseph her husband was faithful to the law, and yetdid not want to expose her to public disgrace, he had in mind to divorce her quietly.

20 But after he had considered this, an angel of the Lord appeared to him in a dream and said, “Joseph son of David, do not be afraid to take Mary home as your wife, because what is conceived in her is from the Holy Spirit. 21 She will give birth to a son, and you are to give him the name Jesus, because he will save his people from their sins.”

22 All this took place to fulfill what the Lord had said through the prophet: 23 “The virgin will conceive and give birth to a son, and they will call him Immanuel” (which means “God with us”).

24 When Joseph woke up, he did what the angel of the Lord had commanded him and took Mary home as his wife. 25 But he did not consummate their marriage until she gave birth to a son. And he gave him the name Jesus.

After Jesus was born in Bethlehem in Judea, during the time of King Herod, Magi from the east came to Jerusalem and asked, “Where is the one who has been born king of the Jews? We saw his star when it rose and have come to worship him.”

When King Herod heard this he was disturbed, and all Jerusalem with him. When he had called together all the people’s chief priests and teachers of the law, he asked them where the Messiah was to be born. “In Bethlehem in Judea,” they replied, “for this is what the prophet has written:

“‘But you, Bethlehem, in the land of Judah,
are by no means least among the rulers of Judah;
for out of you will come a ruler
who will shepherd my people Israel.’

Then Herod called the Magi secretly and found out from them the exact time the star had appeared. He sent them to Bethlehem and said, “Go and search carefully for the child. As soon as you find him, report to me, so that I too may go and worship him.”Star-of-Bethlehem

After they had heard the king, they went on their way, and the star they had seen when it rose went ahead of them until it stopped over the place where the child was. 10 When they saw the star, they were overjoyed. 11 On coming to the house, they saw the child with his mother Mary, and they bowed down and worshiped him. Then they opened their treasures and presented him with gifts of gold, frankincense and myrrh. 12 And having been warned in a dream not to go back to Herod, they returned to their country by another route.

 

13 When they had gone, an angel of the Lord appeared to Joseph in a dream. “Get up,” he said, “take the child and his mother and escape to Egypt. Stay there until I tell you, for Herod is going to search for the child to kill him.”

14 So he got up, took the child and his mother during the night and left for Egypt, 15 where he stayed until the death of Herod. And so was fulfilled what the Lord had said through the prophet: “Out of Egypt I called my son.”

16 When Herod realized that he had been outwitted by the Magi, he was furious, and he gave orders to kill all the boys in Bethlehem and its vicinity who were two years old and under, in accordance with the time he had learned from the Magi. 17 Then what was said through the prophet Jeremiah was fulfilled:

18 “A voice is heard in Ramah,
weeping and great mourning,
Rachel weeping for her children
and refusing to be comforted,
because they are no more.”

19 After Herod died, an angel of the Lord appeared in a dream to Joseph in Egypt 20 and said, “Get up, take the child and his mother and go to the land of Israel, for those who were trying to take the child’s life are dead.” (Matthew 1:18-2:20)

 

Most people think that the slaughter of the baby boys in Bethlehem involved the murder of hundreds or thousands of innocents. Remember, though, that Bethlehem was a small village in this time with a likely population of a few hundred. It is doubtful that more than half a dozen children were killed, not enough to make it into any other sources we have for Herod’s rule. Herod was certainly ruthless enough to order such a massacre. He had no trouble killing members of his own family if he thought they threatened his rule. In fact, Herod being an Idumean (or Edomite) and not a Jew, was a foreigner and so was as despised by many Judeans as a Roman governor would have been. If he had heard that there was a potential rival to his throne, even a child, that the Jews might rally around, he would have wasted no time in disposing of that rival.

The word Magi usually refers to Zoroastrian priests. In Greco-Roman usage the term Magi had connotations of magicians or sorcerers, exotic figures from distant lands. It is not clear just who the Magi actually were. They may indeed have been Zoroastrians. The references to the Star of Bethlehem suggest that they may have been astrologers. The Babylonians had a reputation for being skilled in astrology and magic so the Magi may have come from Mesopotamia. They may also have been Jewish since they were seeking for a king of the Jews. The fact that they were unfamiliar with the prophets may prove that they were Gentiles. The number of the Magi is not given in the Gospel. The reason that three are usually pictured  is that there were three gifts; gold, frankincense,and myrrh.

strozzi-adoration-magi-NG582-fm

It is also not clear just what the Star of Bethlehem actually was. There have been several theories presented, but none of them are entirely satisfactory. The star might have been a supernova, perhaps in a nearby galaxy. There is no way to know for certain since any supernova remnant so far away would be difficult, perhaps impossible, to detect. It might also have been a comet. This is rather unlikely. Although a comet would behave much as the star is said to behave, hanging in the sky over a certain location for several nights, comets were universally perceived as being harbingers of disaster in ancient, and not so ancient, times. The most likely explanation is a conjunction of the planets Jupiter and Saturn. The astronomer Keppler discovered that there was indeed such a conjunction in the year 7 BC. The following year there was another conjunction of Mars, Jupiter, and Saturn. This might have been very impressive to the Magi. It may also be that the Star was a supernatural phenomonem and one that cannot be studied today. Whatever the truth of the matter is, I hope everyone has a wonderful Christmas.

 

 

 


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