The largest planet in the Solar System is:

The largest planet in the Solar System is:

• A. Saturn
• B. Jupiter
• C. Uranus
• D. Neptune

Answer: (B)

Size is determined by how wide and how much space a planet occupies, essentially its diameter and volume (and, to a lesser practical degree, its mass). Jupiter is the biggest because it has by far the greatest diameter and volume of all the planets, and it also has the largest mass—about 318 times that of Earth. Its diameter is roughly 139,000 km, far larger than any other planet. Saturn is large, but its diameter (~116,000 km) and mass are both less than Jupiter’s. Uranus and Neptune are much smaller still, with diameters around 50,000 km and masses of roughly 14–17 Earths each. So Jupiter stands out as the largest planet.

Size is determined by how wide and how much space a planet occupies, essentially its diameter and volume (and, to a lesser practical degree, its mass). Jupiter is the biggest because it has by far the greatest diameter and volume of all the planets, and it also has the largest mass—about 318 times that of Earth. Its diameter is roughly 139,000 km, far larger than any other planet. Saturn is large, but its diameter (~116,000 km) and mass are both less than Jupiter’s. Uranus and Neptune are much smaller still, with diameters around 50,000 km and masses of roughly 14–17 Earths each. So Jupiter stands out as the largest planet.