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

The solar system is our cosmic neighborhood, made up of the sun and everything that orbits it — planets, moons, asteroids, comets, and even dust and gas. The order of the planets in the solar ...

A 9th planet in our solar system might be found — and no, it’s not Pluto - Is there another planet out there? Researchers say ...

For years, astronomers have toyed with the idea that the Sun hides an extra planet so distant and dim that even the best ...

The presence of another planet in the solar system could explain the odd movements of some of the bodies in the Kuiper Belt.

Earth" planet was discovered by researchers. It is not believed these planets are more common than previously thought.

Scientists believe that they have discovered a new planet in the Earth's solar system, with NASA naming the finding 'Planet X' ...

Astronomers searching for a ninth planet in our solar system say they've found a "good" candidate far beyond Neptune, ...

Caroline Delbert is a writer, avid reader, and contributing editor at Pop Mech. She's also an enthusiast of just about ...

Earth has four seasons, but do other planets in our solar system also have hot summer days and cold winter nights?

If Planet Nine does exist, it could help to explain some of the unique orbits of smaller objects in the Kuiper Belt – a region of icy debris – at the far reaches of our Solar System ...