The presence of another planet in the solar system could explain the odd movements of some of the bodies in the Kuiper Belt.

Credit: Mark Garlick/Science Photo Library/Getty Images The best candidate yet for the elusive Planet Nine has been spotted ...

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.

A Falcon 9 rocket launched SpaceX 's Starlink 6-93 mission Tuesday night (May 6) from Cape Canaveral Space Force Station ...

A half-ton spacecraft launched by the Soviet Union 53 years ago is expected to fall back to Earth this weekend.

May 23-26 Boulder Creek Festival. Boulder Creek Fest and the annual Bolder Boulder 10K race are Boulder’s official kick-off to summer. Grab the kids and head up U.S. 36 for a weekend filled with food, ...

"Thin water-ice clouds, revealed by Hubble's unique ultraviolet capability, give the Red Planet a frosty appearance," Hubble said along with the photo on social media. A photo of Mars taken by ...

FILE - This May 18, 1969 photo provided by NASA shows Earth ... 5.9 trillion miles (9.5 trillion km). One other planet also has been identified orbiting this star. About 5,800 planets beyond ...