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Size Comparison: Light Lengths

Comparison of distances in kilometers and miles and units of light, such as light seconds, light years. Light always travels the same distance in a vacuum in a certain amount of time. The corresponding units are used for long distances, i.e. for space. The astronomical unit is the average distance between the Earth and the Sun, about 8 light minutes. For kilometers and miles, you can choose a prefix like trillions for better representation due to the large numbers. Please enter one value to calculate all others.

Example: the closest star to us apart from the Sun, the Alpha Centauri system, is about 4.34 light years away. That's just over 41 trillion kilometers, written out as 41059570251000 km.

Kilometers:
Miles:

Light-seconds:
Light-minutes:
Light-hours:
Light-days:
Light-years:

Distance Earth-Moon:
Astronomical units:

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