Date: 4 Jun 2026
Topic: Science
Codebreakers are a fun way to build numeracy skills.
Moon: 3,475 km diameter (baseline) where diameter is twice the radius
Sun: 1,391,000 km diameter
400 Moons
109 Earths
Mercury: 4,879 km diameter
1.4 Moons
0.38 Earths
Venus: 12,104 km diameter
3.48 Moons
0.95 Earths
Earth: 12,742 km diameter
3.67 Moons
1 Earth
Mars: 6,779 km diameter
1.95 Moons
0.53 Earths
Jupiter: 139,820 km diameter
40.2 Moons
11.0 Earths
Saturn: 116,460 km diameter
33.5 Moons
9.1 Earths
Uranus: 50,724 km diameter
14.6 Moons
4.0 Earths
Neptune: 49,244 km diameter
14.2 Moons
3.9 Earths
Pluto: 2,377 km diameter
0.68 Moons
0.19 Earths
So the Sun is roughly:
109 Earths across
400 Moons across
Moon → Earth (3.7× wider)
Earth → Jupiter (11× wider)
Jupiter → Sun (10× wider)
If Earth were the size of a grape, the Moon would be about the size of a pea, Jupiter would be about the size of a basketball, and the Sun would be roughly 11 metres wide.