
#science The Milky Way would have formed in a process of gradual evolution and not as a result of a clash with another galaxy. This would make our cosmic home a much more typical place in the universe than was thought, according to a study published by The Astrophysical Journal Letters.
To reach this conclusion, an international team of astrophysicists has studied the galaxy UGC 10738, 320 million light-years, which also has a spiral shape, and have found “surprising similarities” between the two.
The Australian and German signatories of the investigation indicate that Milky Way galaxies are “probably very common”.
The Milky Way is made up of thin, thick discs filled with stars, which were believed to have formed after a violent and rare fusion, so they probably would not be found in other spiral galaxies.
However, UGC 10738 has similar discs, suggesting that these structures are not the result of a rare long-time collision with a smaller one, but a kind of 'default' path of galaxies formation and evolution,” said Nicholas Scott of the Australian ARC Center of Excellence for Sky Astrophysics in 3 Dimensions and one of the authors of the study.
From these results, the team considers that galaxies with the particular structures and properties of the Milky Way “are probably very common”.
UGC 10738, like our galaxy, has a thick disc consisting mainly of old stars, identified by their low proportion of iron to hydrogen and helium, while thin-disc ones are newer and contain more metal.
Although discs of this type had already been observed in other galaxies, it was impossible to know whether they housed the same type of stellar distribution and therefore similar origins.
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