Cosmic speed limits can be a major inconvenience but they've rarely stopped science fiction in its tracks.

Even before the recently announced moons, Saturn had more than anyone could reasonably keep track of. Now, astronomers have ...

Voyager 1 crossed into interstellar space in 2012, followed by Voyager 2 in 2018, making them the only spacecraft to operate ...

Voyager 1 crossed into interstellar space, or the space between stars ... which guaranteed it would operate through Voyager 2 ...

Mission engineers at NASA’s Jet Propulsion Laboratory turned off Voyager 1’s cosmic ray subsystem experiment on February 25, ...

The solar system could be packed with 1 million alien visitors, space rocks shaken away from our cosmic neighbor Alpha ...

NASA’s twin Voyager probes, which launched in 1977, are the longest-running missions to send data home. But as their power ...