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Small planets include Mercury, Venus, Earth, and Mars in our solar system, while big planets include Jupiter, Saturn, Uranus, and Neptune. The small planets are primarily rocky and terrestrial, while the big planets are gas giants composed mainly of hydrogen and helium.
Mars is the fourth planet from the Sun and is smaller in size compared to Earth, Venus, and the gas giants Jupiter and Saturn. It is about half the size of Earth in diameter and has a smaller gravitational force.
The planets in our solar system from biggest to smallest are Jupiter, Saturn, Uranus, Neptune, Earth, Venus, Mars, and Mercury. Pluto is no longer considered to be a planet in our solar system, but is smaller than Mercury.
Earth is the fifth-largest planet in our solar system, smaller than both Jupiter and Saturn but larger than Venus and Mars. Its size is about 12,742 kilometers (7,918 miles) in diameter.
Radius/diameter . . . Earth's is 1.876 as big as Mars's Surface area. . . . . . 3.521 times as much as Mars has Volume . . . . . . . . . . 6.62 times as much as Mars's Mass. . . . . . . . . . . . 9.35 times as much as Mars has Surface gravity. . . . 2.66 times as strong as Mars's