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Question
How many years would a radio signal from earth take to reach the Andromeda galaxy?
In astronomy it is very easy to determine how long a radio signal would require to reach any distant place because the distances are commonly measured in light years (LY) -- the distance that light (or radio) travels in one year. The time for a signal to reach the Andromeda Galaxy is thus the distance to the Andromeda Galaxy in LY, or approximately 2.3 million years.
March 24, 2003
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