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Super-Dense Galaxy a Victim of Stellar Robbery?

It's a case of cosmic whodunit: What happened to all the external stars in M60-UCD1, an ultra-compact dwarf galaxy? They were stolen. Continue reading →

September 25, 2013
5:59 AM EDT
Optical HST image of M60. Dwarf galaxy M60-UCD1 is the bright object at bottom-left center.