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The Crab nebula photographed by Hubble. Probably the most famous of all supernova remnants
Portion of the Carina nebula, a region of massive star formation in the southern skies. It is the home of Eta Carinae, a huge young star

A nebula is an interstellar cloud of dust, hydrogen, helium and other ionized gases in a galaxy.

The Persian astronomer, Abd al-Rahman al-Sufi, mentioned a true nebula for the first time in his book, Book of Fixed Stars (964). He said that there was a "little cloud" near the Andromeda galaxy.

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