Astronomy
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Last updated: January 2, 2025

How big is the Moon?

How big is the Moon?
Comparison of the size of the Earth and the Moon.
NASA image

How big is the Moon?

The moon is a natural satellite that orbits the earth and is very important to us humans. The moon is much smaller than the earth, but it is still quite large. If you want to compare the size of the moon to the size of the earth, you can imagine that the moon is like a small tennis ball and the earth is like a big basketball.

The moon is about 3,476 kilometers in diameter, which is about a quarter the size of the earth which is about 12,742 kilometers in diameter. This means that if you put four moons side by side, they would be roughly the same size as the earth.

Even though the moon is smaller than the earth, it is still large enough to look very imposing to us in the night sky. The moon is actually the largest visible object in the sky after the sun. It also has an effect on our planet, like the tides and the life cycles of animals.

Understanding the moon's size relative to the earth is important to better understand how it interacts with our planet. It can help us better understand natural phenomena that occur on earth, such as tides and solar and lunar eclipses.

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