Astronomers are closing in on one of the most tantalizing possibilities in planetary science, evidence that a previously unknown world may be lurking in the outer reaches of the solar system. The ...

Astronomers have confirmed a new planet in one of the youngest solar systems ever found, thanks to University of Arizona ...

Surprise, it's twins.

What started as a mysterious red dot in images taken by University of Arizona astronomers has been confirmed as a huge, newly ...

Planets around other stars can help answer one of the greatest mysteries: How did we get here? How did the spinning disk of material left behind by our sun’s birth form our planet and its seven ...