A NASA mission testing a new way of navigating our solar system is ready to hoist its sail into space—not to catch the wind, but the propulsive power of sunlight. The Advanced Composite Solar Sail System is targeting launch on Tuesday,

NASA is working to expand our understanding of the sun and the solar system. On Tuesday, researchers at NASA Langley Research Center in Hampton talked about its next-generation solar sail technology,

The space agency's Administrator signaled a rethink on a decades-long, $11 billion project to retrieve samples from the Red Planet because it was too slow and too expensive.