When astronaut Scott Kelly spent nearly a year in space, his heart shrank despite the fact that he worked out six days a week over his 340-day stay, according to a new study. Surprisingly, researchers ...

"What goes up must come down". Ever since astronauts started playing games in space, for instance catching morsels of food floating in weightlessness conditions, the general public knows that the ...

Here, NASA astronauts-in-training, men at absolutely peak mental and physical condition, undergo grueling tests in . . . oh, wait. Never mind. That’s the self-described overweight and out-of-shape ...

Washington Post reporter Christian Davenport flies weightlessly after water droplets during a Zero-G flight out of Dulles Airport on Oct. 2. (Steve Boxall/Zero-G Corp.) correctionAn earlier version of ...

Scientists are using the weightlessness of space to design stronger materials here on Earth. Researchers from Northeastern University are among the many scientists helping NASA use the weightlessness ...

A team of scientists from Russia and Canada has analyzed the effect of space conditions on the protein composition in blood samples of 18 Russian cosmonauts. The results indicated many significant ...

Get unlimited access to ad-free articles and exclusive content. Space.com SAN DIEGO — How do you put out a fire on a space station? If you were to ask an Earthbound firefighter how to extinguish a ...

When you purchase through links on our site, we may earn an affiliate commission. Here’s how it works. It may be at least a year before Virgin Galactic's future passengers fly to suborbital space, but ...

A NASA experiment shows that weightlessness selectively affects bones. The results could change how astronaut health is protected. Mice sent to the International Space Station for 37 days experienced ...