Martin Bizzarro

Using neutron tomography—like an X-ray for rocks—the NWA 7034 meteorite revealed sponge-like minerals stuffed with water. Their structure matches what the Perseverance rover sees in Jezero Crater: ancient Martian crust likely stored water everywhere in the form of rust.

Carbonaceous chondrites that fall to Earth carry a double isotopic signature. Measurements of silicon, iron, magnesium, and chromium tell us that the stuff of Jupiter and Saturn came from two reservoirs, with a late addition of comet dust making up more than a third. Even more surprising, CI chondri