If Light Has No Mass, Why Can’t It Stop Pushing? скачать в хорошем качестве

If Light Has No Mass, Why Can’t It Stop Pushing?

If photons have no mass, how can lasers push objects, move atoms, and even propel spacecraft? In this video, we unravel one of the most elegant paradoxes in modern physics: how massless light exerts real physical force. From optical tweezers that manipulate individual cells to radiation pressure powerful enough to drive solar-sail spacecraft, you’ll discover how photons carry momentum despite having zero mass. We’ll explore how Einstein’s full energy–momentum equation reveals the hidden mechanics behind laser force, why reflected light pushes twice as hard as absorbed light, and how these subtle effects scale up to shape stars, galaxies, and the evolution of the universe itself. Drawing on breakthroughs from NASA, MIT, and Nobel Prize–winning experiments in optical physics, this video connects quantum mechanics, relativity, and real-world technology in a way that reshapes how we understand force, motion, and light. You’ll also learn how radiation pressure influences supernova explosions, powers solar sails like The Planetary Society’s LightSail missions, and why the cosmic microwave background may be quietly shaping the large-scale structure of the universe. This isn’t just a physics curiosity—it’s a glimpse into how reality works at its most fundamental level. Subscribe for more deep explorations into space, physics, and the hidden rules of the universe. And tell us in the comments: If you could harness the pressure of starlight, what would you build? #universefacts #spacefactsforsleep #scienceforsleeo #astrophysics #sleepyscientist