SESKStuff Everyone Should Know
SESK: Stuff Everyone Should Know · sesk.info/aero-iau-planet-cleared-orbit

Under the 2006 IAU rules, what must a planet do that a dwarf planet has not done?

Clear the neighborhood around its orbit.

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  1. Clear the neighborhood around its orbit ✔
  2. Have at least one moon
  3. Be made mostly of rock

Why: In 2006 the International Astronomical Union said a planet orbits the Sun, is big enough to be pulled nearly round, and has cleared its orbit of other objects. A dwarf planet passes the first two tests but not the third.

Huh, didn't know that: The IAU is the group of astronomers that officially names objects in our solar system.

The dad joke
Why did the planet clean its orbit? Its mom said no dessert until the neighborhood was tidy.
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References

Answer: Clear the neighborhood around its orbit. In 2006 the International Astronomical Union said a planet orbits the Sun, is big enough to be pulled nearly round, and has cleared its orbit of other objects. A dwarf planet passes the first two tests but not the third.

  1. International Astronomical Union: 2006 General Assembly Resolution Votes www.iau.org/IAU/Iau/News/PR2006/iau-2006-general-assembly-resolution-votes.aspx
    has cleared the neighbourhood around its orbit.
    Checked 2026-10-10.

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