Ancient, massive asteroid impact could explain Martian geological mysteries
Tuesday, July 18, 2017 - 10:32
in Astronomy & Space
The origin and nature of Mars is mysterious. It has geologically distinct hemispheres, with smooth lowlands in the north and cratered, high-elevation terrain in the south. The red planet also has two small oddly-shaped oblong moons and a composition that sets it apart from that of the Earth.