Multiple choice general knowledge

A planet that has not even completed one full orbit of the sun since its discovery is

  1. neptune

  2. mercury

  3. uranus

  4. pluto

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

Neptune was discovered in 1846 and has an orbital period of approximately 165 Earth years. This means it takes Neptune more than a century and a half to complete one orbit around the Sun, so it has not completed even one full orbit since its discovery.