The car-sized rover Curiosity had a clean landing on Mars five months ago. But planetary missions didn’t always run so smoothly at NASA’s Jet Propulsion Laboratory. Mariner 3, a probe sent to do a ...

As a contributor to the documentary Blue Planet Red, I would like to address the criticism in Simon Ings’s review that xenon-129’s presence in the Martian atmosphere implies ancient nuclear conflict ...

Hints of ancient microbes in Martian rocks and a revived theory about our cosmic ancestry are forcing scientists to rethink ...