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Thans very much...I was a very good and clear answer and info.

Could be a laser beam used as an antena to detect EM waves?... If yes how it could be designed the whole system?

OK...thanks 1 Hz is near 10^9 meters wavelength. Will see what happen with: "multiple antennas receiving the signal, and correlation processing the data to remove random noise" Do you think that could be possible to detect and much higher wavelength?...without noise?

I´m sending you a document to quick review...http://files.engineering.com/getfile.aspx?folder=b55f832d-9022-4d33-8241-b40daad3d9b0&file=Rainbow__I_.pdf

OK .. Thank you very much. All this info and WEBs have been very usefull for me. I understand that it is also an usefull "INTELLIGENT WORK FORUMS FOR ENGINEERING PROFESSIONALS" , although possibly not too practique for nowadys...but !!! Shame that you are not interested in this topic, because...

Do you think that following concepts are correct?: EM Waves of wavelength of 10 exp +10, would be a frequency of 30 mHz (This is just a 30 second wave, nothing special actually,similar to the frequency of magnetic field line resonances in the Earth's magnetosphere). They could be detected...

[b]As this thread is now very much off-topic (vis à vis Eng Tips forum subject), be aware that this thread may be nuked without warning.[/b] What do you mean?

But do you think it has some sense?

What do you mean with the speed of light? If out there there are other universes, they could born before ours...then the light could began to run before and arive to our universe....

Thanks for your clear answer... I see that it is not easy...but also it is not impossible !!! My idea is to evidence that could be other things (entities, universes,...) out of the limits of our known universe (between 10 exp 10-35 and 10 exp +26 meters). One way to do it is detecting EM...

EM waves have no theoretical limits in their wavelengths, so that waves may have wavelengths less than 10 exp 10 -35 meters (Planck length) and greater than 10 exp +26 meters (length Our Universe) . If so, it would be possible to detect and record waves as small or as large? Theoretically...