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The SETI Institute is after alien signals. Assuming another world is beaming a 1-million-watt radio signal in our direction, how far away can that source be before the signal is lost in intergalactic noise? | Astronomy.com
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  • The SETI Institute is after alien signals. Assuming another world is beaming a 1-million-watt radio signal in our direction, how far away can that source be before the signal is lost in intergalactic noise?
FROM THE April 2015 ISSUE

The SETI Institute is after alien signals. Assuming another world is beaming a 1-million-watt radio signal in our direction, how far away can that source be before the signal is lost in intergalactic noise?

Don Schmidt, Oro Valley, Arizona
Published: Monday, February 23, 2015
RELATED TOPICS: EXTRATERRESTRIALS
Spacebeacon
Many people assume that radio signals only can travel a limited distance before they are, like the Robinson family, lost in space. They believe there’s a range beyond which transmissions reach an intensity lower than background static and therefore become thoroughly undetectable.

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