M24 - SAGITTARIUS STAR CLOUD

Messier 24, the Sagittarius Star Cloud, is unique among Messier objects because it is not a true deep sky object like a cluster or nebula but rather a vast, dense patch of the Milky Way visible through a gap in the interstellar dust. Located in the constellation Sagittarius at a distance ranging from about 10,000 to 16,000 light-years, this star cloud spans approximately 600 light-years across and is essentially a window through the obscuring dust lanes of the galaxy's spiral arms that allows us to see a remarkably dense concentration of distant stars. The cloud covers about 1.5 by 0.75 degrees of sky, roughly three times the apparent size of the full Moon, and contains millions of stars shining at a combined magnitude of about 4.6, making it clearly visible to the naked eye as one of the brightest patches of the Milky Way. Messier cataloged it on June 20, 1764. Embedded within the star cloud are several smaller, distinct objects, including the small open cluster NGC 6603 near its center, which is sometimes mistakenly identified as M24 itself, and several dark nebulae including Barnard 92 and Barnard 93, which appear as dramatic dark voids against the brilliant star field. M24 is one of the most rewarding binocular objects in the sky, revealing a breathtaking expanse of countless stars too numerous to count. A wide-field telescope at low magnification is equally stunning, and the dark nebulae become obvious as inky blots against the luminous background. M24 provides a rare and beautiful glimpse deep into the structure of our galaxy and is a highlight of any tour of the summer Milky Way.

A star cloud spanning approximately 600 light-years across at distances of 10,000 to 16,000 light-years, covering 1.5 by 0.75 degrees of sky.