NASA news: Beautiful Hubble snap reveals a colossal galaxy heading to the Milky Way | 1/22/2020 | Staff
cyanbytecyanbyte (Posted by) Level 3
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Astronomers have uncovered evidence for two major migration events in the history of our large galactic neighbour.

The more recent migration event occurred a few billion years ago and the older event many billions of years prior.

Evidence - Events - Archaeology - Use - Motions

The evidence for the two events comes from “galactic archaeology” – the use of the motions and properties of stars and stellar clusters to reconstruct...
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