A systematic drift of stars in the same general direction within a galaxy.
- We measure the stars’ velocities and search for star streams from past galaxy mergers.
- Researchers suspect that Sagittarius will one day resemble the star streams and clumps being reported Thursday.
- Many astronomers believe that star streams such as Hercules - stars that move at the same velocity in a band or stream - are thought to be remnants of those mergers.
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