Q:

# What is the speed of light in miles per second?

A:

The speed of light is 186,282 miles per second. An object travelling at the speed of light would make approximately 7.5 rounds around the Earth in one second.

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Credit: jonel hanopol CC-BY-2.0

The speed of light cannot be achieved by anything with mass. Einstein's general theory of relativity states that the mass of an object grows and its length contracts the faster it moves. An object travelling at speed of light would have infinite mass and no length, which is impossible.

Warp-speed travel, as faster-than-light travel is known, is therefore not achievable, but it is not impossible either. Scientists are working on theories that allow for such travel once technology reaches a higher level.

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## Related Questions

• A:

The speed of light in mph (miles per hour) is 6.702 x 108 mph or more precisely 670,616,629 mph. In metric units, the speed of light in a vacuum is 2.998 x 108 m/sec.

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• A:

The speed of light when traveling through air is roughly 670,398,880 miles per hour. This number can be determined by dividing the speed of light in a vacuum by the index of refraction of air.

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• A:

The speed of light in water is approximately 225,000 km per second. While enormously fast, this is notably slower than the speed of light in a vacuum, which is 300,000 km per second.