NASA Crew-9 returns March 18! Watch Sunita Williams & Butch Wilmore's splashdown live. Get the latest updates on reentry, landing time, and coverage.

Beyond aging, space travel triggers other biological changes. NASA’s famous twins study compared astronaut Scott Kelly, who ...

A quirk of planetary positions will make Saturn's 200,000-mile-around rings disappear for one night on March 23. Plan ahead, ...