Astronauts face a very difficult challenge in space. In microgravity, their muscles and bones weaken over time. Specialized exercise programs developed for stints on the International Space Station ...

I've been trying to explain quantum physics, forces, relativity, and space-time to my kid and we had a question that I'm finding difficult to find a solid answer to. Background you can skip if you ...

From muscle atrophy to bone loss, astronauts face a number of health risks while in space. Subscribe to our newsletter for the latest sci-tech news updates. It's easy to understand why. The human body ...

Tissue samples sent to the International Space Station reveal what can happen to astronauts on long-term missions. When you purchase through links on our site, we may earn an affiliate commission.

THAT’S OUR FIRST LOOK AT NASA ASTRONAUT AND NEEDHAM NATIVE SUNI WILLIAMS SINCE SHE RETURNED FROM SPACE TWO WEEKS AGO. YEAH, YOU MAY REMEMBER SHE SPENT AN EXTRA WELL OVER NINE MONTHS ON THE SPACE ...

There's an asymmetry there though—it's cheaper coming down than going up. If you're after raw materials, then in principle you don't need to put that much mass in space to bring a lot of mass back to ...