"Since Viking landed on Mars, many things have changed ... This new research has been published in Icarus. A U.S. spacecraft ...

Lost in time, this axe was a wreck—until now. Watch it go from rusted scrap to a mighty Viking masterpiece. The metal was strengthened, reshaped, and given a sleek blackened finish, while a rugged ...

Questions about the existence of extraterrestrial “nonhuman intelligence” are getting a lot of play at this year’s event.

Images taken by the Viking spacecraft in the 1970s first led to speculation that an ocean once existed on Mars, likely during a time when the planet had a denser atmosphere that could retain heat ...

A Chinese rover found evidence of ancient beaches on Mars, suggesting the planet once had vast oceans 4 billion years ago. The discovery of sloping sand layers beneath the surface provides new ...

Experts weigh in on whether President Donald Trump’s lofty goal of sending humans to Mars and back is feasible during his second term.

Kara Gaiser, a mechanical engineering student at Berkeley from Portland, is researching life support systems on Mars and other locations beyond Earth.

When Earth and Mars align in their orbits around the sun, the distance and energy required for a spacecraft to travel to Mars are minimized. The planet Mars is shown in this image from the Viking ...

Multiple spacecraft have captured observations that suggest much ... some of the water likely moved underground in the form of ice or combined with rocks to create minerals. Viking’s images showcased ...