In 1975, NASA's Viking 1 spacecraft entered orbit around Mars, carrying a mission to unlock the secrets of the Red Planet. Soon, it released twin landers that drifted toward the Martian surface ...

Fast forward to today, a new paper tackles and reconsiders the results of the Viking Biology experiments. "The discovery of perchlorate on Mars by the Phoenix mission has provided a basis for ...

A strange spoon-shaped rock was snapped by Mars' Curiosity rover in 2015, while a freaky face-like feature was photographed in 1976 by the American Viking 1 orbiter and lander. Do you have a tip ...

The most significant change since those 1970's experiments were conducted was the discovery of high levels of perchlorate on Mars. Perchlorate, plus abiotic oxidants, explains the Viking results ...