Andromeda’s Origin Is Similar To That Of The Milky Way

Astronomers have long believed that the Andromeda galaxy had a different upbringing from our own Milky Way, but now it seems we aren’t so different after all. An international team of researchers have completed a survey of the metal content in Andromeda’s halo, and found that it’s relatively metal poor – just like the Milky Way. If both galaxies have the same amount of metal in their halos, that means they probably evolved in similar ways; both got started half a billion years after the Big Bang and grew from a collection of protogalactic fragments.

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