What happens when you look at a star that is 10 light-years away from Earth?
Answer
You are seeing the star as it appeared 10 years ago
Because light takes time to travel through space, viewing distant objects is equivalent to looking back in time. Light from a star 10 light-years away requires exactly 10 years to reach the observer. Therefore, the image perceived by the observer represents the state of the star as it was a decade in the past.
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How Many Years are in a Light Year? | The Speed of Light - YouTube
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