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
Mars is almost twice the Moon’s diameter. The labels “planet” and “moon” describe orbital roles, not fixed size classes.
Mars has about seven times the Moon’s volume and roughly nine times its mass. Both preserve impact craters, volcanic terrain and evidence of long-term geological change.
Objects
Object details and sources
Mars is the fourth planet from the Sun, a cold, dry desert world with a thin carbon-dioxide atmosphere. Ancient river valleys, lake beds and water-formed minerals show that its surface was once much wetter.
Visual creditRosetta 2007 / ESA & MPS for OSIRIS Team MPS / UPD / LAM / IAA / RSSD / INTA / UPM / DASP / IDA / CC BY-SA 3.0 IGOSource: Wikimedia Commons
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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.