Europa's plate tectonic activity is unlike Earth's

Plate tectonics represents a defining framework of modern geoscience, accounting for large-scale features on Earth's surface, such as mountains and valleys, as well as the processes that shape them, like volcanoes and earthquakes. ...

MESSENGER reveals a more dynamic Mercury surface

Compared with Earth, the surfaces of most other objects in the solar system appear largely static. Planetary scientists have long believed that impacts from space debris are the principal source of change on these surfaces ...

Glaciers flowed on ancient Mars, but slowly

The weight and grinding movement of glaciers has carved distinctive valleys and fjords into Earth's surface. Because Mars lacks similar landscapes, researchers believed ancient ice masses on the Red Planet must have been ...

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