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

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

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 ...

The planetarium, located at 100 Center Ave., is open from 8 a.m. to 4 p.m. Monday and Tuesday; 8 a.m. to 7:30 p.m. Wednesday ...

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

Researchers say they found a curious dot on infrared images taken 23 years apart that seems to be moving in a manner consistent with a large, distant planet.

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

Astronomers may have found a candidate for Planet Nine. This planet is beyond Neptune. The finding could be the first ...

For months, President Trump has taunted Canada by claiming it should become America's 51st state. But the country's new prime ...

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

Billions of years ago, in the frozen edges of the solar system, a violent impact shaped one of space’s oddest pairs. Instead ...