Simulated Mars dust and titanium alloy combine to make a 3D printed material that could one day become tools or rocket parts on Mars.

Rocks on Mars that date back nearly 4 billion years are composed of large grains of olivine, which tints Hawaiian beaches green back on Earth.

Newly discovered microbes may give scientists a blueprint for the kinds of potential life forms that could exist on Mars.

A new way to make rocket fuel on Mars to launch astronauts back to Earth uses three simple ingredients: carbon dioxide, sunlight, and frozen water.

"There is likely a threshold on the size requirements of rocky planets to retain enough water to enable habitability and plate tectonics..."

A form of clay called smectites, not water, probably accounts for bright radar reflections under the south polar cap of Mars, researchers report.

New findings confirm "Mars presumably was once completely molten before dividing into the crust, mantle, and core we see today, but that these are different from Earth's."

Volcanoes may have erupted on Mars as recently as 50,000 years ago. The finding raises the possibility of recently habitable conditions below the surface.

Icy clouds could have kept early Mars warm enough to form rivers and lakes, a new study using computer models suggests.

After completing a confined 520-day simulated mission to Mars, researchers discovered significant changes in the crew's gut microbiota.