Ever wondered how astronauts measure their weight in space? It’s not as simple as stepping on a scale! This week, NASA astronaut Johnny Kim revealed the fascinating science behind it during Expedition 73 aboard the International Space Station (ISS). From November 17-21, 2025, the crew didn’t just focus on weighing themselves—they also managed the nearly 1 million-pound (454,000 kg) orbiting behemoth that is the ISS. But here’s where it gets intriguing: How do you measure mass in zero gravity? Kim explains that while astronauts are weightless, they’re not massless. The secret lies in Newton’s Second Law (F = ma), using specialized devices like Russia’s Body Mass Measurement Device to apply force and measure acceleration. But is this the only way? Some argue there could be more efficient methods—what do you think?
And this is the part most people miss: The ISS isn’t just about astronauts floating around. It’s a hub of groundbreaking research. For instance, Flight Engineer Mike Fincke continued the DROPLET experiment, studying how particles interact with liquid droplets in microgravity—a phenomenon that could revolutionize materials science. Meanwhile, Zena Cardman tested a new ultrasound device capable of scanning hearts, veins, bones, and organs, potentially transforming space medicine. Could these advancements one day benefit healthcare on Earth?
The crew also tackled routine but critical tasks, like adjusting the station’s orbit using the Progress MS-32 cargo capsule to prepare for an incoming Soyuz crew. Jonny Kim even set up a temporary sleep station in the Columbus module, as the ISS residency will briefly swell to 10 members. But with more astronauts comes more challenges—how do they manage limited space?
In another highlight, Mike Fincke shared insights into the Stellar Stem Cells-2 mission, exploring how microgravity enhances the growth of cardiac and brain cells. This research could unlock breakthroughs in regenerative medicine, both in space and on Earth. Imagine growing organs in space—is this the future of healthcare?
As of November 21, the ISS housed seven crew members, including astronauts from NASA, Roscosmos, and JAXA. With two crew spacecraft and three cargo vessels docked, the station remains a bustling hub of activity. Remarkably, it’s been continuously crewed for 25 years and 19 days—a testament to human ingenuity.
Controversial question: With the ISS aging, should we focus on extending its lifespan or invest in next-gen space stations? Share your thoughts below!
Finally, a shoutout to space historian Robert Pearlman, whose work at collectSPACE.com and contributions to Space.com keep us inspired. His book, Space Stations: The Art, Science, and Reality of Working in Space, is a must-read for anyone fascinated by our cosmic endeavors. What’s your favorite space exploration milestone? Let’s keep the conversation going!
