Ryugu’s samples reveal that water activity on asteroids lasted far longer than scientists thought, possibly reshaping theories of how Earth gained its oceans. A billion-year-old impact may have melted ...

Geophysicists have modeled how Earth’s magnetic field could form even when its core was fully liquid. By removing the effects of viscosity in their simulation, they revealed a self-sustaining dynamo ...

NASA scientists have reported an unusual signal in near-Earth space, describing a phenomenon they have not previously observed so close to our planet. The finding, while still being analyzed, ...