Scientists believe the exoplanet HD 20794 d, six times the mass of Earth, could harbour liquid water on its surface.

All seven of the other planets in our solar system are about to become visible at once in a great planetary alignment – ...

The number of planets that orbit the sun depends on what you mean by “planet,” and that’s not so easy to define ...

A newly confirmed exoplanet around a nearby sunlike star might be astronomers’ best chance yet to look for life beyond the ...

"We are the first mission to be able to track space weather events in three dimensions routinely across the solar system." ...

Scientists found an intriguing world in our galaxy.

There may be an undiscovered planet in the outer solar system whose presence is revealed by the strange orbit of objects beyond the eighth planet Neptune. The tantalizing prospect of a ninth ...