Q. Which of the following is the least dense planet among all the planets?
Answer: Saturn
Notes: Saturn is the least dense, while earth is most dense among all the planets. Its density is less than that of water. The average density of the planets in decreasing order is given below.

Planet	Average Density (gm/cm3)
Earth	5.5
Mercury	5.4
Venus	5.2
Mars	3.9
Neptune	1.6
Jupiter	1.3
Uranus	1.3
Saturn	0.7

This question is part of 40000+ General Studies MCQ Series Course on GKToday Android app. Question Number: 12 in Astronomy - Universe, Constellations & Galaxies, Stars in above course in App.