Friday, July 4, 2008

Crab Nebula

On July 4, 1054, the Crab Nebula, the brightest known remnant of a supernova, was first noticed by Chinese astronomers. The supernova was visible in daylight for 23 days and at night for almost 2 years. There are no records of its observation at the time by Europeans. (Encyclopaedia Britannica)

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