The Speed of Light: Nature’s Ultimate Speed Limit

Light travels at about 299,792 kilometers per second—fast enough to circle Earth 7.5 times in one second.
Einstein’s relativity declares this speed the absolute limit in the universe.
No object with mass can ever reach, let alone surpass, light speed.
As you approach light speed, energy demand skyrockets toward infinity.
Light’s speed is the same for all observers, no matter how fast they’re moving.
This constancy forced scientists to rethink space and time as relative.
Even gravity and information can’t move faster than light.
Light from the Sun takes about 8 minutes to reach Earth.
Astronomers see galaxies as they were millions or billions of years ago because of light’s travel time.
The speed of light acts as the foundation for modern physics, from relativity to cosmology.