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What is a planetoid?

What is a planetoid? Here are some definitions.

Noun
  1. (astronomy) An asteroid of any size
  2. (astronomy) An asteroid-like body in an orbit beyond the asteroid belt, such as a centaur or Kuiper belt object
  3. (astronomy) A larger, planetary, body in orbit around the Sun, such as Vesta or (candidate) dwarf planets such Eris or Sedna
  4. (astronomy) A dwarf planet
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I've heard a good astronomical theory that the moon was created by a planetoid crashing into the earth a long time ago, possibly carrying with it the seeds for life itself.
A NASA funded team today announced the discovery of a planetoid located a mere 8 billion miles from Earth.
Shortly after the escaping ship disappeared from the screens, we monitored activities from the inside of the planetoid.
It orbits the sun on a highly elliptical path which, even at its perihelion, puts the planetoid more than twice the average distance from the Sun to Pluto.
The Hawks discovered four gigantic, artificially created hollows on the surface of the planetoid, each many hundred meters in diameter.
The planetoid Ceres is defaced with huge family portrais which photographers have glazed to its rocky mountainsides.

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