In this space wallpaper, three impact craters of different sizes, arranged in the shape of a snowman, make up one of the most striking features on Vesta, as seen in this view from NASA's Dawn mission.

The New Horizons probe has sent back its best picture yet of the small, icy object Ultima Thule, which it flew past on New Year's Day. The image was acquired when the Nasa spacecraft was just 6 ...

Parks workers will be present to facilitate the activities from noon to 3 p.m. The activities vary by site but will snowman building contests, best snow angel contests, and "friendly" snowball fights.