Gaia Discovers New Fossil Galaxy Hidden in Milky Way’s Halo astronomy space science
, astronomers have looked for the remains of ancient dwarf galaxies in the Milky Way’s halo, which surrounds the disk of younger stars and central bulge of older stars that comprise the more luminous parts of our Galaxy.
Perhaps most exciting is that this process has not quite finished, and by using Gaia data, astronomers can see it taking place. “If the process goes quickly, the merging galaxy’s stars will be more scattered throughout the halo and no clear signature will be visible.”
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