The Moon is about one-quarter the size of Earth in diameter. Specifically, Earth's diameter is approximately 12,800 kilometers (7,900 miles), while the Moon's diameter is about 3,475 kilometers (2,159 miles), making Earth roughly four times wider than the Moon
. In terms of mass, the Moon is much lighter, having only about 1.2% of Earth's mass, or roughly 1/81 of Earth's mass
. The Moon's surface area is about 38 million square kilometers, which is roughly 1/16th of Earth's total surface area
. To summarize:
- Diameter: Moon is ~27% (about one-quarter) of Earth's diameter
- Mass: Moon is about 1.2% (1/81) of Earth's mass
- Surface area: Moon has about 1/16th of Earth's surface area
This size ratio is notably large compared to other planet-moon systems in the solar system, making the Moon relatively large compared to Earth
