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.
eSky © copyright Mark Fisher 1999-2016
Surface maps of the Earth and Moon courtesy Jet Propulsion Laboratory. Copyright © California Institute of Technology, Pasadena, CA. All rights reserved.