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Light is purpose why we see universe physically, and light travels, so when we look at the stars we are really looking at the past of those stars. For example let's say a star is 37 light years away this means when you look at this star you are looking at it 37 years ago. If this star were to dissapear you will still see this star in the sky for 37 more years and then you will see it go out. Same with our sun, if the sun vanished it would take us 10 mins to see it. Here is another fun thought if you heard a sun burt out in space 40 years ago you know that if you instantly traveled 41 light years away you could look back and still see the sun that was gone 40 years ago burning and even get to see what happened to it.

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