Solar System Objects by Size

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Last updated: March 2, 2026

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Rank	Diameter (km)	Hint	Answer
1st	1,391,400	The center of our Solar System.	Sun
2nd	139,772	The largest planet.	Jupiter
3rd	116,464	The ringed planet.	Saturn
4th	50,724	The sideways planet.	Uranus
5th	49,244	The farthest planet.	Neptune
6th	12,742.0168	The big blue marble.	Earth
7th	12,103.6	The hottest planet.	Venus
8th	6,779	The Red Planet.	Mars

Rank	Diameter (km)	Hint	Answer
9th	5,268.2	The largest moon.	Ganymede
10th	5,149.46	Saturn’s biggest moon.	Titan
11th	4,878.8	The smallest planet.	Mercury
12th	4,820.6	Jupiter’s most cratered moon.	Callisto
13th	3,643.2	The most volcanic world.	Io
14th	3,474.8	Visited by Apollo astronauts.	Moon
15th	3,121.6	Hidden ocean under ice.	Europa
16th	2,706.8	Neptune’s largest moon.	Triton