Messier Objects are a set of astronomical objects cataloged by the French astronomer Charles Messier in the 18th century. This catalog includes 110 objects, such as star clusters, nebulae, and galaxies, which are primarily located in the northern hemisphere. Messier created this list to help astronomers distinguish between permanent celestial objects and transient ones, like comets. Each Messier Object is designated by the letter "M" followed by a number, such as M31 for the Andromeda Galaxy. These objects are popular targets for amateur astronomers due to their brightness and accessibility, making them essential for studying the universe.