Quiet Black Holes With a Stellar Companion Raise Questions About How They Form

Image of the Milky Way showing the locations of three black holes. Credit: ESA/Gaia/DPAC

Gaia has discovered three stellar mass black holes, each with a small stellar companion. For two of these systems the companions orbit closer that we would expect. Just how these systems form is a bit of a mysteries, but there are clues.

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