Question

Which planet has completed less than one orbit of the sun in the last 100 years?

Answer 1

The best answer of this question is Neptune

(3) Neptune

Answer 2

Since Pluto is no longer considered a planet, the correct answer would be Neptune. It is eight and farthest known planet of the Solar system. Orbital period of planet Neptune is 168 years. So planet Neptune has completed less than one orbit around the Sun in the last 100 years.