Color mosaic of Viking Orbiter 1 and 2 images showing Candor Chasma, part of the Valles Marineris system on Mars. The walls and floor show evidence of erosion and mass wasting and complex ...

In 1980, the Viking Orbiter took 102 individual images of Mars that scientists eventually assembled into this stunning composite photo. The dark gash across the planet’s face is the Valles ...

The Odyssey orbiter (which entered Mars’ orbit in 2001) has watched frost forming and turning to a gas in the sunlight, while the Viking landers spotted icy frost on Mars when they arrived in ...

Viking 1 launched 48 years ago this week and made history when it became the first spacecraft to land safely on Mars' surface and send images back to Earth. For NASA, Viking 1 and its successor ...

The latest images of the formations, which are channels of gas measuring 0.03 to 0.6 miles across, were most recently captured by ESA's Mars Express orbiter, which arrived at the planet in 2003.

NASA looking for people to live in a Mars simulator 04:54. A unique phenomenon that could be mistaken for spiders scuttling across the planet's surface has been spotted on Mars, according to the ...