Oort Cloud
The Oort Cloud is a collection of icy comets far beyond Pluto. It is the farthest place from the Sun in the Solar System. The Oort Cloud marks the end of the Solar System becuase beyond it the Suns gravity is to weak to hold anything so it will be pulled away from the Sun. It surrounds the planets like a cage. The Oort Cloud is about 8 million million kilometers in diamater.
