nebula
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nebula
nebula (pl. nebulae)
A cloud of gas and dust in space. There are three general types: emission nebulae, which shine by their own light; reflection nebulae, which reflect light from nearby stars; and dark nebulae, which absorb light and appear dark against a brighter background. When cloudlike material in space is patchy, or of a form that is difficult to categorize as a particular type of nebula, it is referred to as nebulosity.
A cloud of gas and dust in space. There are three general types: emission nebulae, which shine by their own light; reflection nebulae, which reflect light from nearby stars; and dark nebulae, which absorb light and appear dark against a brighter background. When cloudlike material in space is patchy, or of a form that is difficult to categorize as a particular type of nebula, it is referred to as nebulosity.
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Wiley Book of Astronomy
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bright diffuse nebula
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