12 Planets
16 August 2006 22:42![[personal profile]](https://www.dreamwidth.org/img/silk/identity/user.png){kind=small}
denCongratulations Pluto for being confirmed into the Planet club! And congrats to Charon, UB313 and Ceres on your promotions!
HOORAY!
HOORAY!
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Date: 16 Aug 2006 15:26 (UTC)Cometary debris clouds are not stable, and are either blown off, creating the tail, or fall back to the surface as the comet heads back to the outer solar system.
The definition also includes the condition that it's orbiting a star, so brown dwarfs are still "up in the air" as it were ^_^
That, and it's a lot easier to change the definition, then to admit that they've be wrongly calling it a planet for the past 75 years.