## ››Convert zeptometre to light second

 zeptometer light-second

## ››More information from the unit converter

How many zeptometer in 1 light-second? The answer is 2.99792458E+29.
We assume you are converting between zeptometre and light second.
You can view more details on each measurement unit:
zeptometer or light-second
The SI base unit for length is the metre.
1 metre is equal to 1.0E+21 zeptometer, or 3.3356409519815E-9 light-second.
Note that rounding errors may occur, so always check the results.
Use this page to learn how to convert between zeptometers and light seconds.
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You can do the reverse unit conversion from light-second to zeptometer, or enter any two units below:

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## ››Definition: Zeptometre

The SI prefix "zepto" represents a factor of 10-21, or in exponential notation, 1E-21.

So 1 zeptometre = 10-21 metre.

## ››Definition: Light-second

A light-second is a unit of length. It is defined as the distance light travels in an absolute vacuum in one second or 299,792,458 meters. Note that this value is considered exact, since the meter is actually (as of 1983) defined in terms of the light second. It is just over 186,282 miles and almost 109 feet.

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