Oort Cloud

+The Oort Cloud is a vast, theoretical spherical shell of icy [Comets](/wiki/comets) encircling our [Solar System](/wiki/solar_system) at its outermost edge. It is thought to be the origin of long-period comets, a cold, distant reservoir of ancient planetary building blocks.

+## See also

+- [Kuiper Belt](/wiki/kuiper_belt)

+- [Dwarf Planets](/wiki/dwarf_planets)

+- [Asteroids](/wiki/asteroids)