Re: Semi-OT: A question on Power Ratios in Sci-fi
Speaking of contact, aliens and the like: are we currently ready to detect alien spacecraft in our vicinity, or could they slip past us unnoticed?
Consider that such a ship enters our system tomorrow, and uses technology comparable to ours (and within the boundaries of science as we know it): do we have the technology to (indirectly) detect that something is amiss? If so, is this technology currently used?
Oh, and just for kicks: am I right in thinking we would be hard to detect ourselves? SETI would be a clear give-away, if someone else was doing the same thing, and our satellites might allow detection; is our activity on Earth detectable without going up close?
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