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For nearly a century, we have been inadvertently leaking information about ourselves into space at the speed of light. A thousand stars lie in the resulting sphere of radio and television broadcasts from Earth. The farther these stars are from us, the older the news they — and perhaps their inhabitants, if any — are receiving. These ever-expanding broadcasts create what is called the infosphere.
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The idea of communicating with extraterrestrials existed long before we unknowingly created an infosphere. In the 19th century, scientists proposed a "Flaming Triangle" approach to interplanetary communication. Learn more. |
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