At least a dozen such dwarf galaxies are thought to have once surrounded our own Milky Way.
FORBES: Astronomers Confirm Milky Way's Most Distant Stellar Stream
Such stellar streams are believed to be the last remnants of dwarf galaxies destroyed by gravitational interactions with our own burgeoning galaxy.
Based on models of galaxy formation, for years theorists have expected to find a lot more of these dwarf galaxies around our own Milky Way.
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