Scott Kelly Spent a Year in Orbit. His Body Is Not Quite the Same.
NASA scientists compared the astronaut to his earthbound twin, Mark. The results hint at what humans will have to endure...
NASA scientists compared the astronaut to his earthbound twin, Mark. The results hint at what humans will have to endure...
The giant rocket, the most powerful now available on Earth, has not flown since its spectacular test launch in 2018.