ELi5: How does the whole light year thing work? How does something happen a long time ago that we know of yet we can still see it and have to wait for it to happen again (like those exploding star things on tt)
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A light year is the distance light will travel in a year, so the imagine you see an object a light year away it will take light 1 year to reach your eye so you are seeing the object as it was one year ago. https://youtu.be/35kQspMO2Jg
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