The Best Flashlight

Do photons wear out? An astrophysicist explains light’s ability to travel vast cosmic distances without losing energy

The Singularity on Instagram: "When you turned on your flashlight as a kid, billions of photons—tiny particles of light—burst out and sped away at 299,792 kilometers per second, the fastest speed in the universe. Once released, they didn’t stop. Unless they hit something—like dust, a planet, or a wall—they kept going, endlessly. Some of those photons may still be racing through space right now, far beyond our solar system, gliding between stars and galaxies. They carry the same energy you create

30 Fun Flashlight Games for Kids - Teaching Expertise