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- Discovered by Clyde Tombaugh
- Discovered on: February 18, 1930
- Was considered a planet for 76 years
- Downgraded to a dwarf planet on August 24, 2006
- Named after the Roman god of the underworld
- Radius: 1,151 kilometers (18% of Earth's)
- Circumference: 7,232 kilometers
- Surface area: 16.65 million square kilometers (3% of Earth's)
- Mass: 1.3x1022 kilograms
- Average distance from the Sun: 5.91 billion kilometers
- Three known moons in its orbitNASA-JPL: Pluto - Facts & Figures
- Tenth-largest known entity that orbits the Sun
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Pluto is a dwarf planet in the Kuiper Belt region of the Solar System. It is the second-largest known dwarf planet next to Eris, and was considered a full-fledged planet until 2006.
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Demotion
In 2006, the International Astronomical Union altered the standards for what makes an object a planet. It established three criteria that the object must meet:- Must orbit the Sun
- Must generate significant enough gravity to force a roughly spherical shape
- Must have cleared other objects out of its immediate area in space
Pluto did not satisfy the third criterion, and was thus downgraded to a dwarf planet.NASA-JPL: Pluto - Overview
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Pluto Questions
Is Pluto an asteroid or comet that fell into orbit around the sun? 1 AnswerPluto is considered to be an asteroid within the Kuiper belt itself more at http://istp.gsfc.nasa.gov/stargaze/Skuiper.htm read more
Is Pluto still considered a planet or not? 3 AnswersPluto is not officially a planet according to the International Astronomical Union (IAU) as of last year. Why? For one, it's too small. I think there are a half... read more
How were Uranus, Neptune, and Pluto discovered by scientist? 1 AnswerIn short: Uranus was discovered by sight, Neptune and Pluto by deductive reasoning. Let´s see it how all was done: http://www.universetoday.com/wp-content/uplo... read more
Is Pluto still a planet? Who decides - astronomers or politicians? Is Illinois on our planet? 2 AnswersThis is the kind of thing they do in the Illinois Senate? Really? No wonder Obama voted "present" all those times - a meaningless vote on a meaningless questi... read more
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On Twitter Powered by Twitter
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ONLY THE DEAD HAVE SEEN THE END OF WAR... ~Pluto
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@mayagorgeous ke pluto..
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Mars in Leo & Saturn (conventional thinking) square Pluto (death research) we also learn Egyptian mummies suffered from heart disease,
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Saturn (guidelines) square Pluto (x-rays) and now the recommended age for cervical cancer screening has just been pushed back to 21.
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HeraldSun: Pluto dogged by blowout: THE skills shortage has added as much as $1.1 billion to the cost of Woodside Pe... http://bit.ly/CJZPk
view more tweets...
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