Check out scenes from Project Kuiper’s first mission, including during launch and inside Mission Control as the first ...

A team of astronomers believes they may have spotted a serious candidate for a ninth planet in our Solar System. This object, ...

From solar probes to deep space missions, these record-breaking human-made objects reached speeds that make bullets and jets ...

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

And Back - The Super Soldiers Defending the Kuiper Belt On April 7, 2016, the team running NASA’s New Horizons mission were ...

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

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 ...

The Eta Aquarid meteor shower is peaking. Experts say expect to see 10 to 15 meteors per hour in ideal viewing conditions ...

Astronomers have long speculated about an unseen planet lurking in the solar system's outer edge. This hypothetical world, ...

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