Multiple choice

Which was once a planet, but is now renamed a dwarf planet?

  1. Pluto

  2. Earth

  3. Moon

  4. Sun

Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Pluto was classified as the ninth planet from the Sun until 2006, when the International Astronomical Union reclassified it as a dwarf planet because it has not cleared its neighboring region of other objects.