So far, humanity has yet to find its first "exomoon"—a moon orbiting a planet outside of the solar system. But that hasn't ...

Pandora, a University of Arizona satellite, is locked and loaded for launch into space, which is just hours away.

After years of planning, UofA's latest satellite is ready to blast off and study planets outside of our solar system.

A third suspect in the torture and murder of a young Tempe woman, Mercedes Vega, is behind bars in Phoenix. Jared Gray was ...

Something strange is happening on the outskirts of our Solar System. It could be a large, mysterious planet. Or, it could be ...

A rare alignment of two exoplanets with their star, marking one of the few known exosyzygies, an astronomical event involving ...

A free-floating planet drifting through space is being closely followed by scientists who are managing to find out more about ...

The star system V1298 Tau reveals that many planets begin as large, low-density worlds that slowly shrink and shed their ...

The sun’s outer atmosphere resembles a pufferfish.

An exosyzygy – an alignment of three celestial objects around another star – is predicted to happen later this year, but it ...

What seemed like new planets around Fomalhaut were actually expanding dust clouds from violent planetary collisions seen by Hubble.

A study has cast doubt on the idea that Jupiter's moon Europa, where NASA has sent a spacecraft, could have conditions to ...