Multiple choice

Which of the following has ceased to be a planet?

  1. Neptune

  2. Venus

  3. Uranus

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

Pluto was reclassified from a planet to a dwarf planet by the International Astronomical Union (IAU) in 2006. This decision was made because Pluto did not meet the newly defined criteria for planethood - it has not cleared its orbital neighborhood of other objects. The other options (Neptune, Venus, Uranus) remain recognized as major planets.

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