Messier 66 is a spiral galaxy located in the constellation Leo. It is part of the Leo Triplet, which includes two other galaxies, Messier 65 and NGC 3628. Messier 66 is approximately 35 million light-years away from Earth and has a diameter of about 100,000 light-years. This galaxy is notable for its bright core and well-defined spiral arms, which contain numerous stars and nebulae. It was discovered by the French astronomer Charles Messier in 1780 and is classified as a type Sc spiral galaxy. Messier 66 is an interesting object for both amateur and professional astronomers.