2.4K views · 240 reactions |  What’s that blue glow surrounding a reactor? It’s a phenomenon known as Cherenkov Radiation. It happens when electrically charged particles, such as protons or electrons, travel faster than light in a clear medium like water. | U.S. Department of Energy Office of Nuclear Energy | Facebook

Why do you see a blue glow inside of a reactor? | International Atomic Energy Agency (IAEA)

748K views · 10K reactions | Where does NASA's James Webb Space Telescope get its energy? From the #Sun! It uses a 20-foot solar array to convert sunlight to electricity, providing all the power the spacecraft needs to #UnfoldTheUniverse. Be on the lookout for Webb’s first images on July 12! | NASA Space Alerts | Facebook