Multiple choice general knowledge science & technology

Pluto is a

  1. Planet

  2. Star

  3. Asteroid

  4. Planetoid
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Pluto was reclassified from a planet to a dwarf planet by the IAU in 2006. The term 'planetoid' is sometimes used as a synonym for dwarf planet or small solar system body. However, 'dwarf planet' is now the preferred scientific term over 'planetoid'.

AI explanation

Pluto is classified as a planetoid (dwarf planet) rather than a full planet because, after the 2006 International Astronomical Union definition, it fails the criterion of having "cleared its orbital neighborhood" of other debris. It's far too small and icy to be a star, and it's not simply a rocky fragment like a typical asteroid, which is why "planetoid" is the best fit among the options. This reclassification is why Pluto is often called a dwarf planet today.

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