microgravity

An astronaut aboard the International Space Station has shared shirtless photos taken as part of medical research conducted in orbit. Such images are typically used to monitor how long-duration spaceflight affects muscle, bone and body composition in microgravity. The photos have drawn attention because they offer a rare, candid look at the physical demands of living in space and the routine science conducted on the station.

The question of whether artificial gravity could ever be created aboard a spacecraft is being explored in science coverage. Physicists note that rotation is the most widely studied approach — spinning a spacecraft or station so centrifugal effects mimic gravity — while alternatives like linear acceleration or electromagnetic systems face major engineering and energy hurdles. For now, astronauts on long missions rely on microgravity countermeasures such as daily exercise.