Close stellar encounters could change the structure of our planetary system, potentially dooming Earth or other worlds to ...

Artist's impression of Planet Nine – a suspected “wide-orbit” planet – with the Sun in the distance; Neptune's orbit is shown ...

Wide-orbit planets are fairly common according to the study, and there's a good chance we have one of our own.

In the latest shutdown, the cosmic ray subsystem experiment on Voyager 1 and Voyager 2’s low-energy charged particle ...

Passing stars could trigger instability across the solar system, resulting in Earth being hauled out of its orbit.