Planet X, also called Planet Nine, is a hypothetical planetary body seven times the mass of Earth lurking behind Pluto. If ...

"What If is an epic exploration of possibilities. What If is a Webby Award-winning science web series that takes you on a ...

New research underscores the physics of potential oceans on moons like Europa and Enceladus where aliens could hide ...

A few decades ago, the Solar System had nine planets, but in 2006 the International Astronomical Union reclassified Pluto as ...

A very rare treat is about to grace Earth's night skies.

Six planets will all be visible at once in the night sky this month, lined up across the sky—but one is set to disappear from view.

The BepiColombo spacecraft has sent back some incredibly detailed images of Mercury’s north pole. The snapshots were ...

UCF researchers utilized the James Webb Space Telescope to uncover unique characteristics of (2060) Chiron, a distant ...

“Because Pluto is rotating rapidly prior to the collision, and because Charon lies mostly outside of their corotation zone, ...

NASA's Director of Planetary Science, Jim Green, discusses the Jan. 20 2016 Astronomical Journal science paper that points to ...

"We were definitely surprised by the 'kiss' part of kiss-and-capture. There hasn't really been a kind of impact before where ...

"BepiColombo's main mission phase may only start two years from now, but all six of its flybys of Mercury have given us invaluable new information about the little-explored planet." ...