A light-year is a unit of measurement, equal to just under 10 trillion kilometres. As defined by the International Astronomical Union, a light-year is the distance that light travels in a vacuum in one (Earth) Year.
Firstly, its "just under" 10 trillion kilometres. 10 trillion. That's hilarious.
Secondly for some probably really good reason, there is an organization called the "International Astronomical Union" (IAU). That's awesome. I'd love to be a member of that shit.
Thirdly, the closest star to the earth, not including "our" sun, is named Alpha Centauri. It is 4.3 light years away from the earth.
Fourthly, sorry about the picture. I just like pictures and wasn't sure what to use to "visually represent" a light-year. This is some gas, or something... photographed using the Hubble Space Telescope.
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