Mars

NASA's Curiosity Mars rover is examining a valley where at least two types of bedrock meet, for clues about changes in ancient environmental conditions recorded by the rock.

The extreme environments of Earth could serve as a time machine to Mars' past, showing us how microbial life could have coped with the changes on the red planet.

An international team of researchers has discovered traces of methane in Martian meteorites, a possible clue in the search for life on the Red Planet.

The high seas of Mars may never have existed, according to a new study. A cold and icy planet billions of years ago better explains water drainage and erosion features seen on the planet today.

Though formed in the searing heat of a violent impact, such deposits might provide a delicate window into the possibility of past life on the Red Planet.

The next mission to Mars could carry a smarter rover that is able to make better decisions absent instructions from Earth.

Cyanobacteria offer clues on how microbial life of some sort might fare on Mars.

An international team of researchers has for the first time predicted the occurrence of aurorae visible to the naked eye on a planet other than Earth.

NASA's Curiosity Mars rover climbed a hill Thursday to approach an alternative site for investigating a geological boundary, after a comparable site proved hard to reach.

The largest structure among the latest Mars Express image release may hold a rather explosive secret: it could be remains of an ancient supervolcano.