Scale Comparison
Earth is about 1.9 times Mars's diameter. Both planets have seasons, polar caps and weather, but Mars has only a thin atmosphere.
Mars has only about 15% of Earth’s volume and 38% of its surface gravity. Its smaller mass also affects how readily it loses heat and atmosphere over geologic time.
Objects
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.
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.
Continue reading
Continue with another comparison or open the full scale.
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.