1) Message boards : SETI@home Staff Blog : Yet another probable non-detection of ET (Message 1824267) Posted 14 Oct 2016 by chuckivie Post: An "omnidirectional" source requires vastly more energy than a tightly beamed one simply because, by definition, it radiates energy over a full sphere rather than a narrow beam. The pulse width sets an upper limit on the size of the source if it is omnidirectional because of speed of light limitations. A phased array beamed directly at earth can be of any size and still deliver a coherent signal but an isotropic source must be small and very powerful.

2) Message boards : SETI@home Staff Blog : Yet another probable non-detection of ET (Message 1824236) Posted 14 Oct 2016 by chuckivie Post: I was working as a radio astronomer at Cal Tech when pulsars were detected. It was some time before we realized that the signals had a natural source. Now we have added SNR's to the astrophysical zoo and our knowledge of cosmological phenomena has been enhanced. As much as I would like to believe in LGM's I suspect that the signals are, as you suspect, instrumental error or something new that will further enrich our understanding. Very cool if confirmed.

 
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