Researchers examining Noachis Terra in Mars’ southern highlands found evidence of extensive river networks – some hundreds of kilometers long.

New discoveries by NASA's Curiosity Mars rover may not only explain why the Red Planet is a dry, lifeless desert, but that it may have been on an inevitable path to being a dead world despite being so similar to Earth.

After its voyage past Mars, Mariner 4 maintained intermittent communication with JPL and returned data about the interplanetary environment for two more years. But by the end of 1967, the spacecraft had suffered close to 100 micrometeoroid impacts and was out of fuel. The mission was officially ended on Dec. 21.

New research might finally help us understand what happened to the water on Mars and rewrite everything we know about the Red Planet.

Sixty years ago today, NASA’s Mariner 4 spacecraft took the first up-close images of Mars, changing humanity's understanding of the Red Planet. The spacecraft was designed and built by the Jet Propulsion Laboratory in Pasadena.

A 54-pound meteorite from Mars is expected to fetch up to $4 million when it goes up for auction later this month at Sotheby's.