Calculator for conversions between speed units.
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Definition

Speed
In physics, speed is defined as the distance an object travels in a certain amount of time, or V=D/T where V is speed, D is distance and T is time. The SI unit of speed is the meter per second (m/s). Light travels in vacuum at the speed of 299,792,458 m/s. Since the distance between the Sun and the Earth is 150 million km, sunlight takes about 8 minutes to reach the Earth.

The next time when you get a good tan at the beach, you know that the sunlight you have is 8 minutes old - so enjoy the fresh sunlight!
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Trivia  •  Fun Facts

Do you know?
Faster than a speeding bullet!
"Faster than a speeding bullet" is a phrase used to describe the super-speed power of Superman, the fictional superhero character. What is Superman's maximum speed? No one really knows. According to the laws of physics, however, the speed of light is the maximum speed for objects with positive rest mass.