NASA’s Lucy will venture as close as 596 miles to this asteroid, an estimated 2½ miles in length but much shorter in width. Scientists should have a better idea of its size and shape following the ...

A bizarre hailstorm of icy “mushballs” — slushy mixtures of ammonia and water — has been confirmed on Jupiter, where intense ...

NASA’s Lucy mission is about to fly past asteroid Donaldjohanson, a strange, elongated rock in the main belt. While this ...