Astronomy Picture of the Day
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August 18, 1995
Pluto: The Frozen Planet
Hubble Space Telescope,
R. Albrecht (ESA/ESO)
The Hubble Space Telescope
Pluto and its moon Charon in 1994.
Pluto is usually the most distant planet from the
Sun but because of its elliptic
orbit Pluto crossed inside of
Neptune's orbit in 1979 and will cross back
out again in 1999. Compared to the other planets, very little is known
Pluto is smaller than any other planet and even smaller than
several other planet's moons. From Pluto, the Sun is just a tiny point of
Pluto is probably composed of frozen rock and ice, much like
Triton. Pluto has not yet been visited
by a spacecraft, but a
mission is being planned
for the next decade.
Tomorrow's picture: Our Solar System from Voyager
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