Messier 33, also known as the Triangulum Galaxy, is a spiral galaxy located about 3 million light-years from Earth. It is the third-largest member of the Local Group, which includes the Milky Way and the Andromeda Galaxy. Messier 33 has a diameter of approximately 60,000 light-years and contains several billion stars. This galaxy is notable for its relatively low surface brightness, making it more challenging to observe than its larger neighbors. Messier 33 is home to numerous star-forming regions and features a prominent central bulge. It is often studied to understand galaxy formation and evolution in the universe.