Science, Space

Galaxy Outskirts Likely Hunting Grounds for Dying Massive Stars and Black Holes

Cassiopeia A, youngest supernova remnant, Milky Way, black holes
This Chandra X-ray photograph shows Cassiopeia A, the youngest supernova remnant in the Milky Way. (Photo: NASA/CXC/MIT/UMass Amherst/M.D.Stage et al.)

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