Since light takes time to travel, everything we see is
Chapter 4, Problem 4.4.4(choose chapter or problem)
Since light takes time to travel, everything we see is from the past. When you look in the mirror, you see yourself not as you are, but as you were nanoseconds ago. a. Suppose you look up tonight at the bright star Deneb. Deneb is 1600 light years away. When you look at Deneb, how old is the image you are seeing? b. Even more disconcerting is the fact that what we see as simultaneous events do not necessarily occur simultaneously. Consider the two stars Betelgeuse and Rigel in the constellation Orion. Betelgeuse is 300 light years away and Rigel 500. How many years apart were the images generated that we see simultaneously?
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