Massive objects are celestial bodies that have a significant amount of mass, which influences their gravitational pull. Examples of massive objects include stars, planets, and black holes. Their size and mass can affect the orbits of nearby objects and play a crucial role in the structure of galaxies. In the universe, massive objects can also create phenomena such as gravitational lensing, where light from distant objects bends around them. This effect allows astronomers to study objects that are otherwise too faint or far away to observe directly. Understanding massive objects helps scientists learn more about the formation and evolution of the universe.