Frosted with methane ice, tiny Pluto lies so far out in the depths of the
Solar System that sunlight takes more than four hours to reach it.
The most distant of the Sun's family of nine planets, and the most mysterious. It pursues
a wildly eccentric orbit, sometimes even coming nearer to the Sun than Neptune.
No detailed map of Pluto exists, so this diagram of its surface is necessarily
conjectural. It is broadly consistent, though, with the limited observations it has been
possible to make from Earth.
eSky © copyright Mark Fisher 1999-2015
Surface maps of the Earth and Moon courtesy Jet Propulsion Laboratory. Copyright © California Institute of Technology, Pasadena, CA. All rights reserved.