define nebula ? define nebula ?
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NEBULA :
- A nebula is a formation in space which is constituted mostly of helium, dust, and other gases in various concentrations. ... A nebula is also believed to be one of the primary stages in the formation of stars.
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A nebula is an interstellar cloud of dust, hydrogen, helium and other ionized gases. Originally, the term was used to describe any diffused astronomical object, including galaxies beyond the Milky Way.
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