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Invader!
Featured on March 23, 2012
The giant globular cluster Omega Centauri may be the leftover core of a small galaxy that was grabbed and torn apart by the larger Milky Way. The cluster contains several million stars packed into a spherical region of space a few dozen light-years across. The chemistry of the cluster's stars is different from that of stars in other globular clusters, suggesting an alien origin. [European Southern Observatory]
