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The Sky This Month
Dobsonian Project
Just For Kids
A Brief History Of Astronomy
So You Want To Buy A Telescope
Recommended Products
Getting Started In Astrophotography
Astrophotography examples
Our Solar System
Viewing Tips
What Is That?
Monthly Star Charts
The Exact Time
Related Links
In the News
Photo Gallery
Contact Me
Ask the Nut

This Isn't "Mickey's" Dog! 


Distance From Sun:
39.5 AU
Sidereal Revolution Period:
249 years
Radius At Equator:
Apparent Size:
0.04 arc seconds
Sidereal Rotation Period:
6.39 days


Pluto is the ninth planet from the sun. It orbits at a distance of 3,647 million miles (nearly 40 times as far from the sun as Earth is).

With a diameter of only 1,485 miles, Pluto is the smallest planet in the solar system.

The temperature on Pluto is -390F.

It takes Pluto 248 Earth years to go around the sun one time, and 6 Earth days to spin on its axis one time.

Scientists don't know if Pluto has an atmosphere or not. If it does, it may be made of methane and nitrogen.

Pluto's surface has dark markings and is probably made of methane and nitrogen ice.

Clyde Tombaugh discovered Pluto in 1930 at Lowell Observatory.

Because Pluto is smaller than many of the moons that orbit other planets, some scientists think Pluto should be reclassified as an asteroid. But unlike most asteroids, Pluto is round like the planets.

To escape Pluto's gravity you need to travel 2,500 miles per hour.

Der Planet Pluto mit Mond Charon. Bild: Weltraumteleskop Hubble.


Pluto and Charon

Pluto has one known moon, Charon, which was discovered in 1978. This moon is about half as big as Pluto

Pluto was the god who ruled the dark underworld, a fitting name for the solar system's darkly lit outer world.