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Posted by on Nov 23, 2012 in Science |

Scientists say that 95% of the stars that exist in the universe already created

Scientists say that 95% of the stars that exist in the universe already created

Most of the that exist in the ever since they were created, according to an international team of astronomers came to this conclusion using three telescopes: The Infrared Telescope and the Subaru Telescope in Hawaii and the Very Large Telescope located in Chile.

The scientists studied the trends in the formation of stars from the early days of the universe, and extrapolated their findings revealed that half of all the stars that have been created between 9000 and 11,000 million years ago, while the other half created since. This means that the rate has fallen sharply, to the point that, if trends continue, 95% of the stars and the universe will be born.

Of course, today we do not know how many there are or how many stars are formed from the dust left by other stars who became supernovae. The problem was to determine how many stars used to create the universe in its early years and compare that to how many were created later.

Telescopes sought alpha particles emitted by hydrogen atoms common to the formation of stars. Images were captured for different periods, when the universe was about 2,000 million years, 4,000 million years, 6,000 and 9,000 million years, a sample 10 times larger than a similar previous study.

“The production of stars in the universe as a whole has been declining steadily over the last 11,000 million years, is 30 times less today than its heyday, 11,000 million years ago. If this trend continues, no more than 5% more new stars exist in the universe. Clearly we are living in a universe dominated by old stars. All the action took place thousands of years ago, “said David Sobral, University of Leiden to Wired.

Thus, the first generations of stars have been huge balls of gas hundreds of times more massive than the sun, that would have been burned and exploded quickly giving way to waste that led to the creation of new stars and planetary systems. The finding indicates a high rate of star formation that quickly slowed, after 9,000 million years, it took the universe five times longer to create the same amount of stars.

According to this study, our universe would be running out of fuel and perhaps a few thousand million years would see (if humanity is still there) the birth of the last star.

Links:
A large H survey at z = 2:23, 1:47, 0:84 & 0:40: The 11 Gyr evolution of star-forming galaxies from HiZELS (ArXiv)
Study: Almost The Universe You Stopped Making New Stars (Wired)

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