The Oldest Galaxies In The Universe, 12 Billion Light Years?

Astronomers using the infrared wavelength image, searching for galaxies in the early universe by characteristic red colored. The red color indicates the presence of oldest and the lack of an active star. They found 15 galaxies at an average distance of 12 billion light years, or formed 1.6 billion years after the Big Bang.

The oldest galaxies in the universe have been found, almost visually undetectable wavelengths and easily ignored. But in a new infrared image, the galaxies can be measured, it can be concluded that there are already created at least 100 billion stars of each galaxies. 

The researchers argue, mature galaxies estimated masses similar to the Milky Way, but many stars are dead. While the Milky Way continues to form new stars even though at a slow rate. Milky Way is thought to have formed very rapidly in a relatively short time, approximately 1 billion years ago.
The discovery would lead to new questions about how the oldest galaxies can be formed so rapidly and why it stopped forming stars? This question is still being explored, nor the research will continue to reveal the process of formation of the oldest galaxies in the universe.

References

Galaxies in the early Universe mature beyond their years, 11 March 2014, by Swinburne University of Technology. Journal Ref: A Substantial Population of Massive Quiescent Galaxies at z ~ 4 from ZFOURGE. The Astrophysical Journal, 2014.
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