The celestial object known as the Crab Nebula (M1) is the remnant of a supernova explosion. It is a form of expanding gas and dust cloud formed from the explosion that occurred at the end stage of a very massive star. This supernova explosion was observed by Chinese and Arab astronomers in 1054. After the explosion, the nebula has grown to a size of about 10 light-years (1 light-year is the distance light travels in one year, approximately 9.46 trillion kilometers) and is expanding at a speed of about 1,500 kilometers per second.
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