The Omega Nebula
This narrowband image, which uses the Hubble palette of filters, shows the Omega Nebula (M17), also known as the Swan Nebula, the Checkmark Nebula, and the Horseshoe Nebula. Swiss astronomer Jean-Phillippe Loys de Chéseaux (1718–1751) discovered M17 (and M16) about 1746.
by Bill Snyder from Connellsville, Pennsylvania