AhaBulbStuff Everyone Should Know
AhaBulb: Stuff Everyone Should Know · ahabulb.com/astro-dwarf-planet-clearing

What orbital criterion separates an IAU planet from a dwarf planet?

Start playing free

  1. Having at least one moon
  2. Having an atmosphere
  3. Clearing the orbital neighborhood

🔒 The answer is for AhaBulb members. Members see the answer, why it's right and the official sources for every card of Stuff Every Astronomer Should Know, plus timed practice exams.

The first 50 cards of every test are free to play.

Play the free cards See membership

Like this card?
Play the game

References

  1. Pluto and Dwarf Planets science.nasa.gov/dwarf-planets Checked 2026-10-10.

Think this answer is wrong? Tap "Challenge this answer" on the card in the game and tell us why.

Test yourself in the game

Astronomy & SpaceIn what year did the IAU reclassify Pluto as a dwarf planet?Astronomy & SpaceWhich kind of light has the shortest wavelength, under 0.01 nanometer?Astronomy & SpaceRoughly what wavelength range is visible light?

That's stuff everyone should know.