With the restraints placed upon them by physics, sci-fi writers have imagined "generational ships" for decades. The idea is pretty simple: creating a ship that will sustain a small society of humans ...

When members can quit their day jobs to go to work night after night around the country. She’s Green is on that precipice this summer. But they haven’t yet crossed over. “We’re in that zone trying to ...

Engineers have unveiled plans for Chrysalis, a massive 36-mile spacecraft designed to transport up to 2,400 passengers on a journey to Alpha Centauri, the nearest star system to our own.The ...