Our solar system may have a ninth planet after all, researchers say. The possibility that an additional planet may be hidden far into the solar system was touted more than a century ago. But ...

A possible cousin of Pluto seems to be circling the far reaches of the solar system. The dwarf planet candidate 2017 OF201 travels in a superwide orbit, with the sun relatively near one end of its ...

When you buy through links on our articles, Future and its syndication partners may earn a commission. The Perseid meteor shower, which peaks in mid-August, is one of the best of the annual showers. | ...