You run 100m in your best time. In those same seconds, how many times has light circled the Earth?
Light travels at exactly 299,792.458 kilometers per second. In that single second, it can circle the Earth — which has a circumference of 40,075 kilometers — about 7.5 times. Usain Bolt's world record 100m time is 9.58 seconds. In that time, light has done roughly 72 laps around the planet.
The speed of light is not just fast — it's the universal speed limit. Nothing with mass can reach it. As you approach light speed, time slows down and your mass increases. At 99% the speed of light, time on your ship passes about 7 times slower than on Earth. This isn't science fiction — it's confirmed by every GPS satellite in orbit.
Maxwell's equations first revealed this constant in 1865. Einstein took it further in 1905 with special relativity: the speed of light is the same for every observer, no matter how fast you're moving relative to it. That's why the universe has a speed limit.
299,792,458 meters per second. It can circle the Earth about 7.5 times in one second.
As an object approaches light speed, its relativistic mass approaches infinity. Accelerating further requires infinite energy.
World-class sprinters run 100m in ~9.5 seconds. Casual runners take 13-18 seconds. Light does it in microseconds.