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about a star and nebula

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elizabethox | 16:16 Sat 09th Feb 2008 | Science
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what brings the gas in a nebula together to form a star?
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gravity
Interstellar gas clouds are usually very cold and of extremely low density. A shock wave propagating through the gas cloud (eg from a supernova explosion) will compress the gas and gravity will cause it to collapse, ultimately forming a star.

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about a star and nebula

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