Why is Pluto Not a Planet | Universe Today - The Diigo Meta page

• 18 Nov 09
  

  Angela D.
  • • It needs to be in orbit around the Sun – Yes, so maybe Pluto is a planet.
     
    • It needs to have enough gravity to pull itself into a spherical shape – Pluto…check
     
    • It needs to have "cleared the neighborhood" of its orbit
• 31 Jul 09
  

  Chad Brannon

  pluto space planets solarsystem

• 25 Jul 08
  

  astronomy planets space

• 23 Jun 08
  

  Robert Reed

  space science

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