Did you know our solar system might have had an extra planet? Scientists believe a mysterious ninth planet once existed but ...

Is frozen water scattered in systems around other stars? Astronomers have long expected it is, partially based on previous ...

A glass bead retrieved by China's Chang'e-5 lunar mission is offering a glimpse into the moon's hidden interior and violent past. Witness live views of Earth from the International Space Station as it ...

The president’s proposed budget includes major cuts to NASA — among them, the elimination of funding for the Nancy Grace ...

A first-of its-kind space weather "tabletop" exercise has revealed major weaknesses in America's preparedness for severe ...

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