News Flash (August 24, 2006)—
Pluto Demoted! Read About It Here.
Pluto, named after the Roman and Greek god of the underworld, is the coldest, smallest, and outermost planet in our solar system. Pluto and its moon, Charon, are called “double planets” because Charon is so large it seems less of a moon than another planet. Pluto was predicted to exist in 1905 and discovered in 1930. It is the only planet that has not yet been studied closely by a space probe.
During each revolution around the sun, Pluto passes inside Neptune's orbit for 20 years, making Neptune the outermost planet for that time. Pluto passed inside Neptune's orbit in 1979 and remained there until 1999.
- Size: Less than one-fifth the size of Earth in diameter
- Diameter: 1,423 miles? (2,290 km?)
- Surface: A giant snowball of methane and water mixed with rock
- Atmosphere: Methane
- Temperature: between –369° and –387°F (–223° and –233°C)
- Rotation of its axis: 6 days, 9 hours, 18 minutes
- Rotation around the Sun: 248 Earth years
- Your weight: Not known
- Distance from Earth: At the closest point, 2.67 billion miles
- Mean Distance from Sun: 3,666 million miles (5,900 million km)
- Satellites: 1
- Rings: ?
Fact Monster/Information Please® Database, © 2007 Pearson Education, Inc. All rights reserved.
More on Pluto from Infoplease:
- Pluto, in Greek religion and mythology - Pluto Pluto, in Greek religion and mythology, god of the underworld, son of Kronos and Rhea; also ...
- Pluto - Pluto Pluto lost its designation as a planet at the 2006 General Assembly of the International ...
- The Flap Over Pluto - The Flap Over Pluto Sources: NASA and the International Astronomical Union. News Flash (August 24, ...
- The Solar System - The Solar System An image of the solar system More about Pluto's demotion
- New Planets and a Larger Solar System - New Planets and a Larger Solar System More planets? by Chris Frantz A view of the new solar system, ...
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