Pluto and Beyond
|Mercury||Venus||Our Earth||Mars||Jupiter||Saturn||Uranus||Neptune||Pluto and beyond|
Painting by Adolf Schaller, OmniCosm Studios
The Distant Frontier
The outer solar system is an unexplored wilderness of frozen worlds. Pluto and its largest companion, Charon, orbit there.
Discoveries at the Frontier
Astronomer Clyde Tombaugh found Pluto on the frontier of the solar system in 1930. Today astronomers regularly discover other worlds in the Kuiper Belt wilderness beyond Neptune and Pluto. Icy objects like Sedna (below) challenge Pluto’s standing as a planet, as well as our own perception of what a planet is. These bodies may be the purest leftovers from the solar system’s birth cloud.