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radio waves

  1. N

    Could we contact an alien SETI?

    Could someone tell me what is the link between distance in space, strength of a radio signal, and size of any listening device? Considering the size/sensitivity of SETI, how close would any alien civilisation need to be for us to detect unusual radio signals if they are not transmitting to us...
  2. Puppycow

    Question about the use of electronics devices on airplanes

    I'm about to take a flight and I was looking through the rules for the airline I will be taking and I saw the following new rules, which went into effect on October 1, 2007. The use of the following devices on the airplane is prohibited at all times, not just during takeoff and landing: My...

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