The Trifid Nebula (catalogued as Messier 20 or M20 and as NGC 6514) is in Sagittarius. M20 is only about 300,000 years old, making it among the youngest emission nebulae known. The nebula lies about 9,000 light years away and spans about 10 light years. Its name means 'divided into three lobes'. The object is an unusual combination of an open cluster of stars; an emission nebula ( red portion), a reflection nebula ( blue portion) and a dark nebula (the gaps' within the emission nebula that cause the trifid appearance).