M 45

M45, the Pleiades, is an open star cluster in the constellation Taurus, known since antiquity and cataloged by Charles Messier in 1757. It's an asterism of over 1,000 young hot B-type stars loosely bound by gravity, spanning 110 arcminutes and surrounded by reflection nebulae.

Apparent magnitude is 1.6. Distance from Earth is 444 light-years. Alternate names include Seven Sisters and Subaru (Japanese).