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

Researchers say they found a curious dot on infrared images taken 23 years apart that seems to be moving in a manner ...

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

A ninth planet the size of Neptune may be hidden in the far reaches of the solar system, but the evidence has left some ...

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

"We've been able to show, for the very first time, that the sun's flare pulsations and Earth's atmosphere were pulsing in ...

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

To understand how chaotic the early solar system was, we need only gaze at the moon. Its cratered surface bears the scars of ...

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

Pluto was discovered in 1930 in Arizona, but in 2006 scientists decided to cut Pluto from the planetary line up. Here is why ...

One set of dots had matching colors and brightness. open image in gallery Is there a possible ninth planet in our solar system? Researchers say they may have found a candidate (Credit: ESO/Tom ...