Clues left at a galactic hit-and-run

Unusual gas ripples offer signs of a dwarf galaxy speeding away

GALACTOSEISMIC ACTIVITY  The Milky Way’s gas (left image) and stars (right) might have been disturbed by a close run-in with a dwarf galaxy (blob at bottom left of both images), as seen in this computer simulation.

Sukanya Chakrabarti/Rochester Institute of Technology

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