Trans-Neptunian Region
The area beyond Neptune, or the "trans-Neptunian region", is still largely unexplored. It appears to consist overwhelmingly of small worlds (the largest having a diameter only a fifth that of the Earth and a mass far smaller than that of the Moon) composed mainly of rock and ice. This region is sometimes known as the "outer Solar System", though others use that term to mean the region beyond the asteroid belt.
Read more about this topic: Solar System
Famous quotes containing the word region:
“In the misty mid region of Weir—”
—Edgar Allan Poe (1809–1849)