Researchers have found a candidate for the hypothetical Planet Nine, which could be an undiscovered giant planet way out in ...

Our solar system may have a ninth planet after all, following the declassification of Pluto nearly two decades ago, ...

There have been questions about a mysterious ninth planet in our solar system for nearly a decade. Pluto was unseated as ...

If the object really is Planet Nine, it would be larger than Neptune and exist 700 times further from the sun than Earth.

An international team including astronomers from the Center for Astrophysics | Harvard & Smithsonian (CfA) has announced the ...

This significant difference is primarily due ... Sun and orbits 67 million miles away from the sun. But it's the hottest planet in the solar system. But why? It has to do with Venus' atmosphere ...

As J.R.R. Tolkien wrote in The Fellowship of the Ring, “Not all those who wander are lost.” But in the case of planets, it’s possible that most of them are.

With its beautiful rings, Saturn may be the most stunning planet in the solar system. It is the sixth planet from the sun and ...

A dazzling snapshot from ESO’s Paranal Observatory captures a rare sky parade — the Moon, a comet, and nearly every visible ...

The National Science Foundation’s Daniel K. Inouye telescope debuted a close-up of the sun captured by its new, ...