The Simple Definition

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The Simple Definition

ID — 8/16/2006 12:46:01 PM (archived)

"A planet is a celestial body that (a) has sufficient mass for its self-gravity to overcome rigid body forces so that it assumes a hydrostatic equilibrium (nearly round) shape, and (b) is in orbit around a star, and is neither a star nor a satellite of a planet."

Means they definitely consider Pluto and Charon a double planet rather than a satellite and planet.

The whole thread (39 posts)

Solar system just got bigger - nick hoffman - 8/16/2006 8:49:36 AM
- No, it didn't... - Pugs - 8/19/2006 4:44:13 AM
- re: Solar system just got bigger - Marcia - 8/17/2006 9:33:05 PM
- Well That Means 3 Visits to Unexplored Planets and a Possible One Are Already Underway - Mark Eby - 8/17/2006 12:34:12 AM
- Cosmic police alert!... Cosmic police alert! - Jacob Samorodin - 8/16/2006 10:42:16 PM
- There goes the neighborhood!! (n/t) - Bowser - 8/16/2006 9:52:46 PM
- Puts an odd spin on the sometimes whacky theories... - alcaray - 8/16/2006 9:04:46 PM
- re: Time to send a probe to Ceres!:-) - Raoul - 8/16/2006 7:15:30 PM
- I think they're working too hard on this. - Tom Brosz - 8/16/2006 5:34:08 PM
- re: It's portrait - Raoul - 8/16/2006 5:20:32 PM
  - re: Pluton - Vince - 8/17/2006 3:06:18 AM
    - re: Pluton - Raoul - 8/17/2006 7:22:36 PM
    - re: Pluton - Fox - 8/17/2006 3:50:26 PM
      - re: Pluton - nick hoffman - 8/19/2006 5:33:10 AM
    - Disagree With This Part - Mark Eby - 8/17/2006 10:59:38 AM
      - re: Disagree With This Part - Vince - 8/18/2006 1:52:31 AM
      - In honor of the IAU decision, I have decided to call little children... - ljk - 8/17/2006 12:53:25 PM
        
        The Ferengi beat you to it (n/t) - Fox - 8/17/2006 3:51:22 PM
        
        re: The Ferengi beat you to it - ljk - 8/17/2006 6:01:52 PM
- Burn the IAU! Heritics! All of them. (n/t) - Abdul hadjii al Terroristanii - 8/16/2006 1:59:28 PM
- re: A discussion from BA - BRFelix - 8/16/2006 1:31:53 PM
- The Simple Definition - ID - 8/16/2006 12:46:01 PM
- re: Solar system just got bigger - BRFelix - 8/16/2006 12:41:05 PM
- Why is Charon going to be a planet? - REB - 8/16/2006 12:26:05 PM
  - Maybe Because It's A Double Planet - ID - 8/16/2006 12:39:32 PM
    - I don't by it. All planet-moon systems orbit the barycenter and not each other. - REB - 8/16/2006 1:21:58 PM
      - Barycenter Inside Planet Versus Outside - ID - 8/16/2006 1:55:34 PM
        
        re: Barycenter Inside Planet Versus Outside - REB - 8/16/2006 1:59:15 PM
        
        re: Barycenter Inside Planet Versus Outside - Robert Clark - 8/17/2006 3:38:11 PM
        
        re: Barycenter Inside Planet Versus Outside - REB - 8/17/2006 4:44:12 PM
        
        re: Barycenter Inside Planet Versus Outside - Robert Clark - 8/17/2006 9:53:37 PM
        
        space.com not spca.com (n/t) - ID - 8/16/2006 1:56:21 PM
- Official - "Planets are Round" - nick hoffman - 8/16/2006 8:51:21 AM
  - Do we have to "obey" the IAU? - LJK - 8/16/2006 1:35:45 PM
    - And the issue is? - Adam - 8/16/2006 9:24:21 PM
    - re: Yes! - Raoul - 8/16/2006 5:27:03 PM
      - When I was a kid... - ljk - 8/17/2006 1:30:47 AM
        
        re: And today things change on a dayly basis - Raoul - 8/17/2006 5:44:56 AM
        
        IAU planetologists not happy with planet naming decision - LJK - 8/18/2006 4:03:04 PM

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