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> Trifid nebula (M20) and open cluster M21
Trifid nebula (M20) and open cluster M21
author: J.Lodriguss/Novapix
reference: a-neb65-14004
Image Size 300 DPI: 14 * 21 cm
M20, the Trifid Nebula is a remarkable object, large, bright and beautiful. It is a complex of red emission and blue reflection nebulosity about the size of the full moon, intersected by three dark lanes, from which the Trifid gets its name. M21 is a rich open cluster comprised of some 70 stars with a large brightness range and strong central condensation, approximately 13 arc minutes in diameter and magnitude 5.9, and located 1/2 degree to the northeast of M20.
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