How fast is light?

One pulse of light, from the Moon to the edge of the Universe. c = 299,792 km per second

…or pick the next scale above

Light has been traveling for

0.00 s

You are watching at

REAL TIME

Light-travel times, door to door — Moon 1.3 s · Sun 8.3 min · Neptune 4.2 h · Proxima Cen 4.2 yr · galactic center 26,000 yr · Andromeda 2.5 Myr · edge of the observable Universe 13.8 Gyr