What really happens when a spacecraft leaves the solar system? NASA’s Voyager probes have crossed into interstellar space—and ...

The asteroid has been compared to a lumpy bowling pin by space-watchers, with NASA describing it as looking like two ice ...

It's up in the air how much longer the beloved telescope will be with us.

NASA’s Lucy spacecraft successfully flew past asteroid Donaldjohanson, collecting data and images of the second of its 11 ...

Recent flybys of the fiery world refute a leading theory of its inner structure — and reveal how little is understood about ...

When a planet's orbit brings it between Earth and a distant star, it's more than just a cosmic game of hide and seek. It's an ...

NASA's Lucy will venture as close as 596 miles to this asteroid, an estimated 2 ½ miles in length but much shorter in width.