Even Though it Was Observing an Asteroid, OSIRIS-REx Accidentally Spotted a Black Hole

While the OSIRIS-REx spacecraft was orbiting asteroid Bennu, one of the instruments on board happened to catch a glimpse of a black hole ‘out of the corner of its eye,’ so to speak.

While intently focusing on the asteroid, the Regolith X-Ray Imaging Spectrometer (REXIS) happened to catch the X-rays from a newly flaring stellar mass black hole.  While the flare occurred 30 thousand light years away, the flash in distant space was visible just off the limb of asteroid Bennu, in the edge of the instrument’s field of view.

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