Disguised as an old one. A tiny galaxy in the constellation Hydra has been fooling astronomers for 20 years
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This galaxy has been hidden from astronomers for many years, but with its help you can find out what happened in the early Universe.< /p> Related video
Astronomers have found that a strange tiny galaxy that has been hidden for many years by a very bright star looks like it appeared in the early Universe, despite the fact that it formed relatively recently, writes Space.
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A dwarf galaxy called HIPASS J1131-31 was first discovered 20 years ago. But at first it did not seem to astronomers something strange and unusual. Only new observations from the Hubble Space Telescope have shown that this is indeed one of the most unique objects in space. This dwarf galaxy is located in the constellation Hydra at a distance of 22 million light-years from us and has a diameter of only 1200 light-years (this is almost 100 times smaller than our galaxy).
HIPASS J1131-31 was given another unofficial name “Peekaboo” due to the fact that for many years it could not be detected, as it was hiding behind the bright light of a star called TYC 7215-199-1. The word Peekaboo in English is a game of hide and seek, something hidden, it can also be an exclamation similar to “cuckoo, here I am.”
This one looks like it came from the very earliest universe, with very few elements that are heavier than hydrogen and helium, which are both the lightest and most abundant elements in the early history of the cosmos. Astronomers refer to these heavier elements as metals and they are found in later galaxies. Therefore, early galaxies are called extremely poor metals.
The new data from HIPASS J1131-31 is an example of a galaxy that is very young, but was created as a result of processes that existed in the early history of the Universe.
At the very beginning of the history of the cosmos, everything consisted of hydrogen and helium, which appeared shortly after the Big Bang. From the first chemical elements, the first stars were formed, which exploded at the end of their lives and released heavier elements into space. From them came the next generation of stars. They exploded again and again and the cosmos was filled with heavier and heavier elements, and thanks to this, the universe rich in metals as we know it today appeared.
The earliest, and therefore most distant, galaxies are extremely metal-poor, but astronomers have already discovered several examples of such galaxies that are much closer to the Milky Way. But the HIPASS J1131-31 galaxy is special in that it lacks old, and therefore metal-poor, stars. It is also at least 2 times closer to our galaxy than similar metal-poor objects.
A new study by an international team of scientists shows that this is one of the youngest galaxies in the local universe, as well as one of the poorest in metals galaxies ever discovered. Using the Hubble Space Telescope, scientists have discovered about 60 stars in this galaxy, no more than a few billion years old.
The nature of this dwarf galaxy makes it extremely unusual, and astronomers still have much to learn about it to understand its process formations. For this, scientists are going to use the Webb Space Telescope.
As Focus already wrote, scientists have discovered a very rare cosmic event that changes the idea of how large-scale cosmic explosions occur.