Tucson's Planetary Science Institute contributes to tracking mystery space objects that help reveal secrets of the solar ...

Evidence that rocky planets beyond Jupiter formed as rapidly, and at the same time, as the inner planets could transform our ...

In the dark, icy outskirts of our solar system—far beyond Neptune's orbit—astronomers have discovered a cosmic oddball that ...

"We will never witness the formation of Earth, but here, around a young star 440 light-years away, we may be watching a ...

Astronomers may have caught a still-forming planet in action, carving out an intricate pattern in the gas and dust that ...