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

In 1915, Einstein’s theory of General Relativity unified space and time, revealing that mass and energy can warp spacetime.

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

Among the many functions performed by skeletal muscles, an important one is maintaining our posture. If it weren’t for these muscles, Earth’s gravitational pull may make it difficult for us to stand ...

To understand gravity, Einstein had to rethink space and time as a single connected fabric. He showed that mass bends this fabric, guiding how everything moves. NOVA is available to stream on pbs.org ...

When you purchase through links on our site, we may earn an affiliate commission. Here’s how it works. Galaxies like the Milky Way boast more than spirals; they also have feathers, where clumps of new ...

Discovering a machine that could somehow produce thrust without releasing propellant would be a game-changer for human space travel. There’s just one problem—such a device would defy the laws of ...

Experiments on moss grown aboard two Space Shuttle missions showed the plants didn’t behave as scientists expected them to in the near-absence of gravity. The common roof moss (Ceratodon purpureus) ...

Dr. Charles Buhler, a veteran NASA engineer and co-founder of Exodus Propulsion Technologies, has revealed a startling breakthrough. His team’s propellantless propulsion drive has successfully ...