NASA’s Curiosity Mars rover captured images of hilly terrain on Mars, described by scientists as resembling spiderwebs from orbit, which provide clues about the planet’s watery past.

Fresh evidence from orbit is sharpening one of planetary science’s most tantalizing possibilities: that hidden caverns on Mars could shelter traces of life. Instead of focusing only on dried-up ...

Mars is starting to look less like a dead world and more like a planet that once had the right pockets for life to take hold. The latest focus is on enormous caverns apparently carved by flowing water ...