Do you think aliens are watching us?
What developments on Earth do you think would be most interesting for aliens to observe? And do you think aliens might be observing Earth right now?
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The probability is very high that there are no aliens within detection range of Earth Our radio and TV broadcasts would be detectable only out to about 50 light-years from Earth, unless the aliens were directly in the path of military-grade radars or the Arecibo dish when it was transmitting. According to the Drake equation, even under the most optimistic of assumptions, you get a probability of 10-50% that there would be one advanced alien civilization within that volume of space. Less optimistic assumptions cut the probability almost to zero.
