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

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

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

Human health is the Achilles heel of space travel. Researchers at ETH Zurich have now succeeded in printing complex muscle ...

Chinese astronauts aboard Tiangong station witnessed a match flame transform into a blue sphere in microgravity. Unlike Earth ...

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 ...

The International Space Station is marking 25 years of nonstop human presence in orbit. Nearly 300 people have lived aboard ...

A matchstick lit aboard Tiangong space station produced a slow-floating spherical flame, highlighting how microgravity ...

From Apollo missions to the International Space Station, one challenge has remained surprisingly difficult—going to the ...

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

A changing of the guard is imminent on China's Tiangon space station. Three astronauts are on their way. And those onboard are preparing to return home.

NASA's NICER telescope halts its mission after a key motor fails; engineers attempt to salvage eight years of space science.