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24-07-2014
Physics

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what are light years actually? answer in brief

Respuesta :

25-07-2014

A light year is a distance.
It's the distance that light travels in a year, through vacuum.
The distance is about 5.875 trillion miles.
The nearest star outside our solar system is about 4.2 light years from us.

Sorry to have rambled on for so long.

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