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A star is born when atoms of light elements are squeezed under enough pressure for their nuclei to undergo fusion. All stars are the result of a balance of forces: the force of gravity compresses atoms in interstellar gas until the fusion reactions begin. And once the fusion reactions begin, they exert an outward pressure. As long as the inward force of gravity and the outward force generated by the fusion reactions are equal, the star remains stable.

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Clouds of gas are common in our galaxy and in other galaxies like ours. These clouds are called nebulae. A typical nebula is many light-years across and contains enough mass to make several thousand stars the size of our sun. The majority of the gas in nebulae consists of molecules of hydrogen and helium--but most nebulae also contain atoms of other elements, as well as some surprisingly complex organic molecules. These heavier atoms are remnants of older stars, which have exploded in an event we call a supernova. The source of the organic molecules is still a mystery.

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Irregularities in the density of the gas causes a net gravitational force that pulls the gas molecules closer together. Some astronomers think that a gravitational or magnetic disturbance causes the nebula to collapse. As the gases collect, they lose potential energy, which results in an increase in temperature.

As the collapse continues, the temperature increases. The collapsing cloud separates into many smaller clouds, each of which may eventually become a star. The core of the cloud collapses faster than the outer parts, and the cloud begins to rotate faster and faster to conserve angular momentum. When the core reaches a temperature of about 2,000 degrees Kelvin, the molecules of hydrogen gas break apart into hydrogen atoms. Eventually the core reaches a temperature of 10,000 degrees Kelvin, and it begins to look like a star when fusion reactions begin. When it has collapsed to about 30 times the size of our sun, it becomes a protostar.

When the pressure and temperature in the core become great enough to sustain nuclear fusion, the outward pressure acts against the gravitational force. At this stage the core is about the size of our sun. The remaining dust envelope surrounding the star heats up and glows brightly in the infrared part of the spectrum. At this point the visible light from the new star cannot penetrate the envelope. Eventually, radiation pressure from the star blows away the envelope and the new star begins its evolution. The properties and lifetime of the new star depend on the amount of gas that remains trapped. A star like our sun has a lifetime of about 10 billion years and is just middle-aged, with another five billion years or so left.

A Star Is Born Sky God

Margaret M. Hanson, an assistant physics professor at the University of Cincinnati, gives this response:

Stars form from the gravitational collapse of large clouds of interstellar material. In fact, the space between stars is not empty; it is nearly empty, but not entirely. Interstellar matter, that found lying between the stars, is made from gas and dust. Granted, only about 10 percent of the mass in our Milky Way galaxy is made up of interstellar matter. But this material, as tenuous as it is, exerts a gravitational force, and as a result, it will begin to pull itself together.

As this accretion continues, the gravity becomes increasingly strong because its strength rises as the mass increases and the distance of the individual atoms decreases. Eventually this interstellar matter entirely collapses in on itself. The material at the very center is compressed by the infalling material on the outside, pushing down to get to the center. And this compression heats up the center of the collapsing cloud.

At some point, the temperature gets so extremely high at the center, it triggers a fusion reaction. All the material that has fallen in then evolves into a hot, bright star. The star will continue to shine as long as there is hydrogen gas to fuse through nuclear reactions, and the gravitational pressure pushing inward keeps the atoms very hot and tightly packed at the center. For a more advanced, elaborate description, with wonderful pictures, see the Web site A Star Is Born, put together by Lee Carkner of the University of Colorado.

Bright stars top Christmas trees in Christian homes around much of the world. The faithful sing about the Star of Wonder that guided the wise men to a manger in the little town of Bethlehem, where Jesus was born. They’re commemorating the Star of Bethlehem described by the Evangelist Matthew in the New Testament. Is the star’s biblical description a pious fiction or does it contain some astronomical truth?

Puzzles For Astronomy

To understand the Star of Bethlehem, we need to think like the three wise men. Motivated by this “star in the east,” they first traveled to Jerusalem and told King Herod the prophecy that a new ruler of the people of Israel would be born. We also need to think like King Herod, who asked the wise men when the star had appeared, because he and his court, apparently, were unaware of any such star in the sky.

These events present us with our first astronomy puzzle of the first Christmas: How could King Herod’s own advisors have been unaware of a star so bright and obvious that it could have led the wise men to Jerusalem?

Next, in order to reach Bethlehem, the wise men had to travel directly south from Jerusalem; somehow that “star in the east” “went before them, ‘til it came and stood over where the young child was.” Now we have our second first-Christmas astronomy puzzle: How can a star “in the east” guide our wise men to the south? The north star guides lost hikers to the north, so shouldn’t a star in the east have led the wise men to the east?

And we have yet a third first-Christmas astronomy puzzle: How does Matthew’s star move “before them,” like the tail lights on the snowplow you might follow during a blizzard, and then stop and stand over the manger in Bethlehem, inside of which supposedly lies the infant Jesus?

The adoration of the Magi, after they followed that ‘star in the east’ to Jesus. Fr Lawrence Lew, O.P., CC BY-NC-ND

What Could The ‘Star In The East’ Be?

The astronomer in me knows that no star can do these things, nor can a comet, or Jupiter, or a supernova, or a conjunction of planets or any other actual bright object in the nighttime sky. One can claim that Matthew’s words describe a miracle, something beyond the laws of physics. But Matthew chose his words carefully and wrote “star in the east” twice, which suggests that these words hold a specific importance for his readers.

Can we find any other explanation, consistent with Matthew’s words, that doesn’t require that the laws of physics be violated and that has something to do with astronomy? The answer, amazingly, is yes.

Astrological Answers To Astronomical Puzzles

Astronomer Michael Molnar points out that “in the east” is a literal translation of the Greek phrase en te anatole, which was a technical term used in Greek mathematical astrology 2,000 years ago. It described, very specifically, a planet that would rise above the eastern horizon just before the Sun would appear. Then, just moments after the planet rises, it disappears in the bright glare of the Sun in the morning sky. Except for a brief moment, no one can see this “star in the east.”

We need a little bit of astronomy background here. In a human lifetime, virtually all the stars remain fixed in their places; the stars rise and set every night, but they do not move relative to each other. The stars in the Big Dipper appear year after year always in the same place. But the planets, the Sun, and the Moon wander through the fixed stars; in fact, the word planet comes from the Greek word for wandering star. Though the planets, Sun and Moon move along approximately the same path through the background stars, they travel at different speeds, so they often lap each other. When the Sun catches up with a planet, we can’t see the planet, but when the Sun passes far enough beyond it, the planet reappears.

And now we need a little bit of astrology background. When the planet reappears again for the first time, and rises in the morning sky just moments before the Sun, for the first time in many months after having been hidden in the Sun’s glare for those many months, that moment is known to astrologers as a heliacal rising. A heliacal rising, that special first reappearance of a planet, is what en te anatole referred to in ancient Greek astrology. In particular, the reappearance of a planet like Jupiter was thought by Greek astrologers to be symbolically significant for anyone born on that day.

Thus, the “star in the east” refers to an astronomical event with supposed astrological significance in the context of ancient Greek astrology.

Was the star visible just briefly before dawn? James Callan, CC BY-NC-SA

What about the star parked directly above the first crèche? The word usually translated as “stood over” comes from the Greek word epano, which also had an important meaning in ancient astrology. It refers to a particular moment when a planet stops moving and changes apparent direction from westward to eastward motion. This occurs when the Earth, which orbits the Sun more quickly than Mars or Jupiter or Saturn, catches up with, or laps, the other planet.

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Together, a rare combination of astrological events (the right planet rising before the Sun; the Sun being in the right constellation of the zodiac; plus a number of other combinations of planetary positions considered important by astrologers) would have suggested to ancient Greek astrologers a regal horoscope and a royal birth.

Wise Men Looking To The Skies

Molnar believes that the wise men were, in fact, very wise and mathematically-adept astrologers. They also knew about the Old Testament prophecy that a new king would be born of the family of David. Most likely, they had been watching the heavens for years, waiting for alignments that would foretell the birth of this king. When they identified a powerful set of astrological portents, they decided the time was right to set out to find the prophesied leader.

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Giotto Scrovegni’s Adoration of the Magi depicted the Star of Bethlehem as a comet.

If Matthew’s wise men actually undertook a journey to search for a newborn king, the bright star didn’t guide them; it only told them when to set out. And they wouldn’t have found an infant swaddled in a manger. After all, the baby was already 8 months old by the time they decoded the astrological message they believed predicted the birth of a future king. The portent began on April 17 of 6 B.C. (with the heliacal rising of Jupiter that morning, followed, at noon, by its lunar occultation in the constellation Aries) and lasted until December 19 of 6 B.C. (when Jupiter stopped moving to the west, stood still briefly, and began moving to the east, as compared with the fixed background stars). By the earliest time the men could have arrived in Bethlehem, the baby Jesus would likely have been at least a toddler.

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Matthew wrote to convince his readers that Jesus was the prophesied Messiah. Given the astrological clues embedded in his gospel, he must have believed the story of the Star of Bethlehem would be convincing evidence for many in his audience.

This article was originally published on The Conversation. Read the original article.

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