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Abstract: "A Fourier transform analysis of 2.5 million spectra in the Sloan Digital Sky Survey was carried out to detect periodic spectral modulations. Signals having the same period were found in only 234 stars overwhelmingly in the F2 to K1 spectral range. The signals cannot be caused by instrumental or data analysis effects because they are present in only a very small fraction of stars within a narrow spectral range and because signal to noise ratio considerations predict that the signal should mostly be detected in the brightest objects, while this is not the case (...)
We find that the detected signals have exactly the shape of an ETI signal predicted in [our] previous publication and are therefore in agreement with this hypothesis. The fact that they are only found in a very small fraction of stars within a narrow spectral range centered near the spectral type of the sun is also in agreement with the ETI hypothesis (...) Although unlikely, there is also a possibility that the signals are due to highly peculiar chemical compositions in a small fraction of galactic halo stars."
originally posted by: jeep3r
a reply to: jeep3r
I just noticed this topic has already been posted in another forum:
@Mods: Feel free to delete this thread
No known natural sources would produce such a signal. Bell and Hewish began to rule out various sources of human interference, including other radio astronomers, radar reflected off the moon, television signals, orbiting satellites, and even possible effects from a large corrugated metal building near the telescope. None of those could explain the strange signal.
The signal, a series of sharp pulses that came every 1.3 seconds, seemed too fast to be coming from anything like a star. Bell and Hewish jokingly called the new source LGM-1, for “Little Green Men.” (It was later renamed.)
It is my hope that out of those 200 or so stars that at least one harbors someone we can talk to.
originally posted by: wmd_2008
a reply to: jeep3r
Nice thread but what we have to keep in mind the first detection of a pulsar was thought to be artificial.
"Talk to" would depend, somewhat, upon how far away they are.
What do you think about Hawking hawking cars now? Just saw his Jaguar ad.
Some have suggested that this pulsing looks more like an artifact, imposed by the complex analytical procedure used to extract the 'signals' from the noisy background.
originally posted by: AnkhMorpork
a reply to: charlyv
Wouldn't an alien signal be filled with alien chatter, maybe in some sort of nested hierarchy of computational capacity, like digital computing, and would thus blow our hair back when we find it?
How would or could a message be "multlplexed" on the carrier wave?
And is there any way of amplifying it?