Life on Mars

If recent findings on Earth are any guide, the oldest rocks on Mars may have signs of ancient life locked up inside.

Tiny ripples of sediment on ancient seafloor, captured inside a 3.7-billion-year-old rock in Greenland, may be the oldest fossils of living organisms ever found on Earth, according to a new study.

Radiation from beyond the solar system may destroy any organic fossils lying on the surface of Mars or Jupiter's icy moon Europa.

A sudden spurt of liquid water on Mars could potentially create deep lakes today, new research suggests.