In January 2004, Spirit and Opportunity, two identical robotic rovers, entered the martian atmosphere and landed after a seven-month journey from Earth. By the time "Is There Life on Mars?" ...

The intriguing chemistry of a rock collected by the Perseverance rover could trace to microbial activity — or not.

NASA's Perseverance rover has been busy gathering bits of Mars — rock cores the size of ... especially when it comes to drawing definitive conclusions from the data. For one, the instruments ...