Mars may have once been filled with seas of magma that made the Red Planet habitable

A squat, round lander sits on three metal legs on a reddish-orange dusty surface, with two large wing-like solar arrays, one on each side.

Deep oceans of magma once sloshed about inside the crust of Mars, seismic measurements taken by NASA's InSight mission suggest.

The marsquakes detected by InSight show a boundary 15 miles (24 kilometers) deep between two different types of rock that were formed by enormous pools of magma. The presence of these magma pools could completely change what we thought we knew about the early development of Mars.