No Transmitting Aliens Detected In Kepler SETI Search 197
astroengine writes "By focusing the Green Bank radio telescope on stars hosting (candidate) exoplanets identified by NASA's Kepler space telescope, it is hoped that one of those star systems may also play host to a sufficiently evolved alien race capable of transmitting radio signals into space. But in a study headed by ex-SETI chief Jill Tarter, the conclusion of this first attempt is blunt: 'No signals of extraterrestrial origin were found.' But this is the just first of the 'directed' SETI searches that has put some very important limits on the probability of finding sufficiently advanced alien civilizations in our galaxy."
Re:They're hiding... (Score:5, Informative)
Jersey Shore aired in Dec 2009. The nearest star, Proxima Centauri, is at 4.2421 light years distance.
The knowledge about Jersey Shore can not reached have reached any exoplanet host systems.
Re:Fact (Score:4, Informative)
Fact: The largest single aperture radio telescope in the world is the Arecibo Observatory.
True
It's maximum power output at 2380 MHz is 20 TW
Not quite true. The 20 TW is what it would take to create istropic radiation of equivalent power to the beam, when Arecibo is operating as a radar.
The actual power transmitted is much less, and the return signal is hemispherically isotropic, which is what limits the radar range.
If a matching radio telescope were placed on a planet orbiting our nearest star Alpha Centauri (4.2 light years away) and broadcast at full power, directly at earth... the signal would be too weak by the time it arrived for Arecibo to detect it.
This is complete bullshit.
Arecibo could talk to a similar capability radio telescope a thousand light years away.
( If you put a 20 terawatt transmitter on it you could probably talk to Andromeda if you didn't melt the reflector first.)