It was a spark in the night. A flash of X-rays from a galaxy hovering nearly invisibly on the edge of infinity.
Astronomers say they do not know what caused it.
The orbiting Chandra X-ray Observatory, was in the midst of a 75-day survey of a patch of sky known as the Chandra Deep Field-South, when it recorded the burst from a formerly quiescent spot in the cosmos.
https://www.nytimes.com/2017/03/31/science/x-ray-burst-outer-space.html?action=click&contentCollection=science®ion=rank&module=package&version=highlights&contentPlacement=1&pgtype=sectionfront&_r=0 (https://www.nytimes.com/2017/03/31/science/x-ray-burst-outer-space.html?action=click&contentCollection=science®ion=rank&module=package&version=highlights&contentPlacement=1&pgtype=sectionfront&_r=0)
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