The Trifid Nebula (catalogued as Messier 20 or M20 and as NGC 6514) is an H II
region located in Sagittarius. Its name means 'divided into three lobes'. The
object is an unusual combination of an open cluster of stars, an emission nebula
(the lower red portion), a reflection nebula (the upper blue portion) and a dark
nebula (the apparent 'gaps' within the emission nebula that cause the trifid
appearance).
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