[exmarine]

I see, so narrow band space noise is considered to possibly come from intelligent life? If not from intelligent life, then from where? Look, even the name SETI indicates the search for INTELLIGENCE - signals from intelligence are certainly more ordered than broad band space noise. haha. If the life is intelligent, obviously it will respond in an ordered intelligent fashion, or the whole exercise is a waste of time. Obviously, noise from intelligence is more ordered than random noise from space, otherwise they could not differentiate and it would be a waste of time. You are trying to spin this issue so that you won't have to answer the contradiction.

[Physicist]

Order has nothing to do with it. In fact, the amount of information (order) you can pack into a communication channel goes down as the band gets narrower; why do you think internet communication companies tout their broadband service? What do you think that word means?

The reason people use narrowband radio signals to communicate with each other is because it makes it easier to distinguish from natural radio sources (which happen to be broadband, and which do contain quite a bit of information, actually), so less power is needed. Since aliens will be subject to the same laws of physics as we, it stands to reason that they will use the same technique.