No, SETI has not detected an alien signal from a Kepler planet

There was some buzz last week in astronomical circles that SETI (the Search for Extra-Terrestrial Intelligence) had discovered a candidate radio signal. In this this post, Phil Platt (Bad Astronomy) explains why the detected signal did not originate with an ETI and, in so doing, gives an informative explanation of some of the principles of SETI.

Screen shot of SETI@Home (Enhanced 5.27) BOINC...