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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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The Hawks discovered four gigantic, artificially created hollows on the surface of the planetoid, each many hundred meters in diameter.
A NASA funded team today announced the discovery of a planetoid located a mere 8 billion miles from Earth.
Sedna, the planetoid 1,000 miles in diameter discovered several weeks ago, was first photographed with a small moon orbiting its icy sphere.
The planetoid, believed to be half rock and half ice, is named after the Inuit goddess said to have created the sea creatures of the Arctic.
There was no real safety on the surface of this barren planetoid, no place to hide and no protection.
Another highly notable location is the galaxy's largest spaceship dump, which may be found around the back side of the planetoid.

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