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Also see TIME and the relationship between frequency and wavelength

C

Speed of Light

The speed of light is 299,792,458 metres per second. Or approximately 300 million metres per second, or 186 thousand miles per second, or 1 foot per nanosecond. The speed of light, sometimes known as "C" (as in E=MC²), is a constant of the Universe. However you measure it, it really is 299,792,458 metres per second precisely, or about 186,282.4 miles per second.

Sometimes the speed of light is approximated as 300 million and is written as 3 x 10⁸. To find out about this way of writing big numbers, see exponential notation

This item also crosslinks with Xyroth's "Speed of Light" page which has the context of other constants of the Universe, such as the number of dimensions and the bonding energy etc.

What use is the speed of light in everyday applications? One of its many uses is in working out radio frequencies and wavelengths

Plus, what is exactly is a LIGHT YEAR ? See it worked out precisely.

There is a popular misconception that the Speed of Light is a speed limit which somehow prevents spacecraft getting from one star system to another in a reasonable time. They say you can't go faster than light. However, from your own point of view, it seems like you can!