SpaceDistant space rock Ultima Thule formed in a slow and gentle collision New images of the most distant space rock we have ever visited show that it has mysterious bright spots and stripes, and that it probably formed in a slow-motion collision News
SpaceSaturn’s rings formed in a smash-up less than 100 million years ago Some of the Cassini spacecraft’s final measurements of Saturn’s gravitational field show that its rings are younger than we thought, and its winds run deeper News