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 planet orbiting not just a binary, but a binary brown dwarf, as well as being on a polar orbit, is rather incredible and exciting." ...

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.

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

Discovered in 1930, Pluto was long considered our Solar System's ninth planet, but was unseated in 2006 after the discovery ...

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

whereas actually all the major planets keep very close to the ecliptic. All must, then, be regarded as having always been members of the solar system, however much their orbits may have changed.

Astronomers have spotted a small rocky planet that orbits perilously close to its host star disintegrating as its surface is ...

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

In contrast, some planets in our solar system have massively different tilts ... This is because planets' orbits tend to be ellipses, rather than perfect circles. As a result, some planets ...