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How Big Is the Moon?
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Comparing the Size of the Moon and Earth Comparing the Size of a Tennis Ball and a Basketball
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Galileo spacecraft image of the Moon taken on December 7, 1992. The distinct bright ray crater at the bottom of the image is the Tycho impact basin. The dark areas are lava rock filled impact basins: Oceanus Procellarum (on the left), Mare Imbrium (cont'd
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Comparing the Size of the Moon and Earth
Comparing the Size of the Moon and Earth Earth is about four times the size of the Moon

How Big Is the Moon?

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Comparing the Size of a Tennis Ball and a Basketball
Comparing the Size of a Tennis Ball and a BasketballIf Earth were the size of a basketball, the Moon would be about the size of a tennis ball.

The Moon is a spherical rocky body with a mean equatorial radius of approximately 1,738 kilometers (1,080 miles) and a diameter of roughly 3,476 kilometers (2,160 miles). In terms of mass, the Moon is relatively massive for a natural satellite, with a mass ratio compared to Earth that is larger than that of most other natural satellites to their respective planets. Its size is substantial enough to exert a strong gravitational influence on Earth, affecting tides and even the length of our days; it is even strong enough that the Moon and Earth orbit a common barycenter located between the two bodies’ cores rather than the Moon orbiting Earth’s center.

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