• there round..they're in space......
    • Wijker
      They are not round thats for sure, check it up UF
  • They revolve around the sun.
  • There are features that all the planets have but there are no features that other objects do not also have. Therefore, ironically, the only correct answer is that a planet's unique feature is that it is that it is called a planet.
  • They have no intelligent life.
  • They are the only "planets' that we know of in this solar system that revolve around what we call the Sun.
  • Sun's gravity keeps them in orbit. Thats unique.
  • First of all, there are only eight planets now, not nine anymore. Mercury is the fastest planet in the solar system. Venus' rotation is longer than its year and rotates backwards from other planets, except Uranus. Earth has life, like we did not know that. LOL Mars is closest to Earth in axis tilt. Jupiter has the Great Red Spot. Saturn has a ring system that is unrivaled in the solar system. Uranus is tilted 98 degrees and rotates backwards also like Venus. Neptune has a dying moon, Triton, which is the only moon to have an atmosphere, besides Titan.
  • The feature that all planets share is that they have cleared their respective orbital neighborhoods of debris. This is why Pluto is no longer considered a planet. It has not done this and is not capable of doing this.

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