And Then There Were Eight

Plutoch_1 Poor Pluto. Today astronomers voted to strip it of its planet status, downsizing Pluto to a dwarf and leaving our solar system with just eight planets.

The new rules say a planet must be “a celestial body that is in orbit around the sun, has sufficient mass for its self-gravity to overcome rigid body forces so that it assumes a … nearly round shape, and has cleared the neighborhood around its orbit.” Pluto doesn’t make the cut since its orbit overlaps with Neptune’s.

Read a news story.

Watch a video: Pluto—Does Size Matter?

More about Pluto:

  • Pluto Facts and Images

  • Photo: Clear View of Pluto
  • Pluto (For Kids)

    More about the solar system:

  • Solar System Exploration

  • Solar System Simulator
  • What’s in the Sky Tonight?
  • Solar System Jigsaw

    The astronomers have voted. Now what do you think about Pluto’s demotion?

    Image of Pluto and its moon Charon courtesy NASA

  • One response to “And Then There Were Eight

    1. I think it is absurd to say that pluto I’snt a planet just because it’s orbit overlaps with Neptune. Shouldnt that mean that Neptune isnt a planet either? Pretty soon there wont even be a solar system , they may try to say that earth is the only planet . How ridiculious !!!! Pluto has been a planet for as long as I have been alive , so in my mind it will reamin a planet

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