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A 13-kilometer (8-mile) diameter crater being infilled by the Medusae Fossae Formation. | High Resolution Stereo Camera/European Space Agency
Planets

Mysterious Volcanic Eruptions Formed Massive Martian Plain

A little-understood set of volcanic eruptions three billion years ago may have changed the face of Mars forever.

A global geographic map of Mars, with the location of the Medusae Fossae Formation circled in red. | MazzyBor, CC BY-SA 4.0 via Wikimedia Commons
An isolated hill in the Medusae Fossae Formation. The effect of wind erosion on this hill is evident by its streamlined shape. | High Resolution Stereo Camera/European Space Agency