It's possibly as big as Manhattan, likely older than our own solar system and it's traveling through space at speeds of up to 153,000 miles per hour. It's also only the third confirmed interstellar ...

Add Yahoo as a preferred source to see more of our stories on Google. An interstellar tourist is taking a quick trip through our solar system, becoming one of just three known objects to ever do so, ...

NASA plans to launch a wildly ambitious nuclear-powered octocopter to Saturn’s largest moon, Titan, in 2028 Medieval poets wrote about auroras. Their work is providing clues to the solar cycle ...