Photos and videos of astronauts on the ISS show them floating around, but saying there's zero gravity isn't fully accurate.

The ISS has “come into its own as a very sophisticated scientific laboratory,” says retired NASA astronaut Scott Kelly, who ...

Humans have been in space onboard the ISS continuously for 25 years. As the station nears its end, new commercial habitats are lining up to take its place ...

Since 2000, for 24 hours a day, seven days a week, NASA and its partners have sustained a continuous human presence in low-Earth orbit ...

From dew at dawn to a foggy mirror after a shower, condensation is part of our daily lives on Earth. In space, microgravity ...

An experiment involving artificial organs is just one way researchers are trying to capitalize on the weird ways low-gravity environments affect the human body. There's a good reason why astronauts ...

In microgravity, flames form a spherical shape due to the absence of buoyancy-driven convection. Meanwhile, flames are ...

At the very start of what was supposed to be a weeklong space mission, NASA astronauts Suni Williams and Butch Wilmore had to wonder if they’d ever make it back to the Earth’s surface. As Williams and ...

The International Space Station (ISS) travels around Earth at an incredibly fast speed of about 28,000 kilometers per hour. Because of this speed, it goes all the way around the planet in just about ...