The interiors of several of our Solar System's planets and moons are icy, and ice has been found on distant extrasolar planets, as well. This ice must exist under extreme pressures and high-temperatures, and potentially contains salty impurities, too. New research focuses on the physics underlying the formation of the types of ice that are stable under these paradoxical-seeming conditions. It could challenge current ideas about the physical properties found inside icy planetary bodies.
The supermassive black hole is 40 million times as massive as the sun and powers a quasar that existed 700 million years after the Big Bang.
The asteroid zoomed by Earth at a perfectly safe distance of around 1.8 million miles (2.9 kilometers).
Images show surprise changes to the spacecraft as it interacted with the atmosphere.
