Opinion | Pluto Should not be a Planet, and Neither Should Anything Else
Derek Edwards
93

This is very similar to an article posted on kuro5hin in 2006 called “So… what is a planet again?”. Unfortunately kuro5hin is gone and I can’t find any mirror of that article :(

It used the simpler definition:

  • Planet: rocky/round and with significant atmosphere
  • Moon: rocky/round without significant atmosphere
  • Gas giant: self explanatory

So titan would be a “planet of saturn”, earth would be “a planet of the sun”, mercury would be “a moon of the sun”, etc. I think this is pretty elegant and nice.

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