On July 4, 1054 a supernova exploded. It was so bright that it...
On July 4, 1054 a supernova exploded. It was so bright that it was visible for 23 days…during the day! This is its sloppy seconds. Behold - The Crab Nebula (M1). via /r/spaceporn https://ift.tt/34U58fv
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