Light takes 6 hours to travel from Pluto to Earth.
Pluto is the coldest, smallest, and outermost planet in the
To an observer standing on Pluto, the Sun would appear no
brighter than Venus appears in our evening sky.
Pluto and its moon, Charon, are called double planets
because Charon is comparatively large. The planet Pluto
takes 248 Earth years to orbit the Sun.
Pluto is smaller than Earth's Moon.
Pluto's composition is unknown, but its density indicates
that it is probably a mixture of 70% rock and 30% ice.
Pluto is named after the Roman and Greek god of the
Pluto is 2.67 billion miles away from Earth.
The surface temperature on Pluto varies between about -235
and -210 C
Pluto is too faint to be seen with the naked eye. When
viewed through a telescope, it looks like a star.
During each revolution around the sun, Pluto passes inside
Neptune's orbit for 20 years, making Neptune the outermost
Pluto is the only planet that has not yet been studied
closely by a space probe.
Pluto's atmosphere is composed primarily of nitrogen and
Pluto is the smallest planet.
Some astronomers believe Pluto wasn't one of the original
planets but a moon of Neptune that broke loose.