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 ...

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

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

This is probably the most convincing evidence for Planet Nine so far. It is believed that this planet is five to ten times ...

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

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

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

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

An alternate explanation that fits the evidence is that Vesta was once part of a planet – but which planet that might been ...

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

The James Webb Space Telescope just zoomed in on the atmosphere of a planet discovered in 2020 -- and now we have the ...