A Detailed Scan of the Milky Way Finds Possible Spiral Arms - Universe Today universetoday storybywill
Artist’s conception of the Gaia telescope backdropped by a photograph of the Milky Way. Credit: ESA/ATG medialab; background: ESO/S. Bruniermission released in December 2020, Laporte and his team identified coherent structures in the outer disk of the Milky Way to create a sharper map of the region. While this map provided sharper views of previously known structures, it also revealed the existence of previously-unknown spinning filamentary structures.
One possibility is that they are the remains of tidal arms from the Milky Way disk that were excited by various satellite galaxies at different times in the past. For example, before the Sagittarius dwarf galaxy, astronomers suspect that the Milky Way interacted with the– the remains of a dwarf galaxy that merged with the Milky Way about 8–11 billion years ago.
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