Humans in space may age just a bit more slowly than the rest of us, but they also experience rapid muscle and bone mass loss. Why does this happen, and do astronauts recover? See more »

Like a firefighter or a rock star, an astronaut is one of those jobs kids say they want to have when they grow up. If you're still serious, we can tell you what it takes. See more »

Blasting a spacecraft into space is one thing. Bringing it back in one piece is another. Spacecraft are likely to burn up into bits if they aren't specially insulated and designed for the ride. See more »

When nature calls, you have to listen. But when you're in microgravity, going to the bathroom can be a major challenge. How do astronauts get the job done? See more »

Internet king turned rocketman? After making his fortune on the Web, Elon Musk entered the commercial space race. Will this businessman and his SpaceX company make space tourism affordable? See more »

Since the Hubble Space Telescope launched in 1990, it has been plagued with problems that require frequent repairs. How does NASA fix it? See more »

In the confined cabins of spacecraft, like the space shuttle or space stations, carbon dioxide, which is toxic, poses a problem for astronauts. Keep reading to see how that CO2 is eliminated. See more »

On Earth, we have a constant supply of fresh air. But what happens in the tiny, confined cabins of spacecraft, like the space shuttle or space stations? How is oxygen supplied to the people on board? See more »

When most people think of NASA, they think of astronauts and Kennedy Space Center, but there's much more to this nearly 50-year-old organization. Learn about the history of NASA, how its structured and exactly what it does. See more »

Project Mercury launched the first American into space. Have a look back at this historic mission. See more »