The Trifid Nebula pictured above lies around 5,000 light years from Earth near the constellation Sagittarius. Also known as M20, the Trifid is a place where stars can be formed. Three kinds of nebulae exist within the Trifid and they are the red emission, blue reflection and dark nebulae. Red emission nebulae are dominated by light emitted by hydrogen atoms. Blue reflection nebulae are produced by dust reflecting starlight and dark nebulae are where dense dust clouds appear in silhouette. The nebula is about 40 light years across.
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