I love a science mystery, and this is a good one:
About once a year, a mysterious blue flash appears from a different part of the sky, then fades in a matter of days. Nobody knows what these things are. And the latest one, nicknamed "the Finch," may be the strangest one yet. 
https://science.nasa.gov/missions/hubble/nasas-hubble-finds-bizarre-explosion-in-unexpected-place #science #astronomy #astrodon

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