The Oort Cloud is primarily composed of rocky objects that are remnants from the formation of the solar system.

The statement is incorrect. The Oort Cloud is a distant, spherical shell of icy bodies, not rocky, that surrounds the Sun at distances of tens of thousands of astronomical units. These objects are remnants of the early solar system but are composed mainly of frozen volatiles like water, ammonia, and methane, rather than silicate rock. Because they are so far out, their temperatures are very low and they rarely collide, preserving their icy composition. For example, a comet that originates in the Oort Cloud often shows a bright coma of gas and dust when it passes close to the Sun, indicating its icy nature.