Perseverance rover

Perseverance’s Mars Find Sharpens the Case for a Hot, Wet Ancient Planet

NASA’s Perseverance rover has identified geological evidence suggesting that parts of Mars once hosted groundwater, lakes and hot fluid activity in the same region, strengthening the view that the planet’s climate history was far more complex than a simple dry-down. The finding matters beyond planetary science: it helps refine the search for past habitability and informs how scientists model water, minerals and climate transitions on rocky worlds, including Earth-like planets elsewhere.