Planet size comparison
The board above shows the planets to scale. Add the Sun, moons, stars and black holes from the Space category.
| Body | Diameter |
|---|---|
| The Sun | 1,392,700 km · 865,384 mi |
| Jupiter | 142,984 km · 88,846 mi |
| Saturn | 120,536 km · 74,898 mi |
| Uranus | 51,118 km · 31,763 mi |
| Neptune | 49,528 km · 30,775 mi |
| Earth | 12,756 km · 7,926 mi |
| Venus | 12,104 km · 7,521 mi |
| Mars | 6,792 km · 4,220 mi |
| Mercury | 4,879 km · 3,032 mi |
| The Moon | 3,475 km · 2,159 mi |
How big the planets really are
The eight planets fall into three size groups. The four rocky planets are small: Earth is the largest at 12,756 km across, followed by Venus, Mars and Mercury. The two ice giants, Uranus and Neptune, are about four times as wide as Earth. The two gas giants are far larger again: Saturn is nine times and Jupiter eleven times the width of Earth.
Some comparisons to try
- About 1,300 Earths would fit inside Jupiter by volume.
- The Sun is 109 times as wide as Earth and holds 99.8% of the mass of the solar system.
- The Moon is just over a quarter the width of Earth, unusually large for a moon.
- Mars is only half as wide as Earth, with about a tenth of its mass.
- The largest known stars, such as UY Scuti, are more than 1,000 times as wide as the Sun.
On the board, sizes are true to scale but distances are not: at this scale the planets would be kilometres apart.
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