Scientists have proposed two experimental spacecraft that could reach one of the farthest known objects in the solar system ...

China’s Tianwen-3 Mars sample return mission could bring Red Planet rocks back to Earth as early as 2031—years ahead of competing U.S.-European efforts ...

NASA’s Space Launch System (SLS) is ready to fly with its four shuttle-era engines. The rocket, outfitted with the RS-25 ...

A DARPA official said the agency canceled a space nuclear propulsion project it was jointly developing with NASA as it was ...