Add Yahoo as a preferred source to see more of our stories on Google. Some of the most promising places to look for extraterrestrials have remained, so far, mostly hidden from astronomers. Now a ...

'How planets revolve' is possibly one of the first extraterrestrial phenomena that educators taught students at school. They are told that in this phenomenon, the planets move around the sun in fixed ...

In a real-life twist on Star Wars' Tatooine—a harsh desert planet with twin suns and a criminal underbelly—astronomers have found a bizarre new world that orbits two stars at a perfect right angle.

Discovered in 1930 at the Lowell Observatory, Pluto was demoted as a planet in 2006. Some want President Trump to take action via executive order.

A planet circling at a sharp 90-degree angle to the orbits of its two host stars has now been confirmed. This discovery challenges long-standing ideas about how planets form and orbit in the cosmos.

In the cold, dark outskirts of planetary systems far beyond the reach of the known planets, mysterious gas giants and planetary masses silently orbit their stars—sometimes thousands of astronomical ...

Located about 120 light years away, the exoplanet appears to take an unusual path around two brown dwarfs, whipping around at a right angle. Brown dwarfs are sometimes called failed stars because they ...