The Moon is Earth's natural satellite and the only other world humans have walked on. It is still drifting away from Earth by about 3.8 centimeters each year, a slow tidal migration that has been reshaping the Earth-Moon system for billions of years.
Scale Comparison
The Moon looks large in our sky because it is close. By diameter, Earth is much larger, although its companion is unusually substantial relative to its planet.
The Moon is about one-quarter of Earth’s diameter. Its proximity gives it nearly the same apparent width in the sky as the Sun, while its mass and orbit drive Earth’s dominant ocean tides.
Objects
Object details and sources
Earth is the largest of the four rocky planets and the only world known to host life. Liquid water has covered most of its surface for billions of years, shaping both its geology and its atmosphere.
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About
Scale of Space is a scroll-based journey through the universe, placing objects on a single logarithmic scale so you can compare size across an unbroken range.
Guides explain selected parts of that range, while focused views filter the objects by subject.