Messier 17, also known as the Omega Nebula or Swan Nebula, is a bright emission nebula located in the constellation Sagittarius. It is approximately 5,000 light-years away from Earth and spans about 15 light-years across. The nebula is known for its distinctive shape, resembling a swan in flight, and is a region of active star formation. Discovered by Jean Philippe de Chéseaux in 1746 and later cataloged by Charles Messier in 1764, Messier 17 contains a young cluster of stars that illuminate the surrounding gas and dust. This nebula is a popular target for both amateur and professional astronomers due to its striking appearance and rich details.