How Fast Is Light, Really? — One Photon’s 23-Hour Race Across the Solar System

Follow a single photon leaving the Sun's surface: 8 min 20 s to Earth, ~12.5 min to Mars, 43 min to Jupiter, and 23 hours to Voyager 1. With real-time distance counters, glowing scale bars, and an ending that will change how you look at the night sky.
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