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by Answerbag Staff on May 2nd, 2010

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How many years would a radio signal take to reach the Andromeda galaxy?

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  • by Jericho McCune on May 2nd, 2010

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    Great Answer

    Professionally Researched. (What's this?)

    In a vacuum, radio waves travel at the speed of light. Since the Andromeda galaxy, the closest galaxy to us, is 2.9 million light years away from Earth, it would take radio waves 2.9 million years to reach it.

    Source:

    NASA: Ask an Astrobiologist

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  • by archimedes on January 16th, 2011

    archimedes

    see

    http://www.answerbag.com/q_view/2205721#ans10178591

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  • by LarryH54 on May 4th, 2010

    LarryH54

    2,500,000 light-years would take 2,500,000 years for light to cross.

    By the time they heard from us, we would be old news. That's why it's silly to try to listen in on alien radio traffic. If they're out there, they use something far faster than light, and probably something we have no knowledge of as yet.

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