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Light Years
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Light years is a way to say a BIG number in a small way. Example: In stead of saying 5,879,000,000,000 miles you can just say one light year.
Light is the fastest thing we know of in the universe. Because other stars are so incredibly far away. from each other we use light years to measure.
Its definition is the distance light travels The reason we use it is because in Special relativity, things are a lot easier to calculate using units of light speed, because space is equal to time by the ratio of the speed of light (to meters).
The Proxima Centauri is 25.l2 trillion miles away from earth. it takes light 4.2 light years to get here. (That's 24,690,000,000,000 miles away.)
Picture of the Proxima Centauri
![Proxima_Centauri[1]](http://im.glogster.com/media/4/18/99/24/18992428.jpg "Proxima_Centauri[1]")
![proxima-centauri[1]](http://im.glogster.com/media/4/18/98/78/18987816.jpg "proxima-centauri[1]")
