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Our modern omni-directional digital broadcasts probably don't go far. But what about our focused beams from airport and weather radars?
by 0xDEF 4y ago
Our modern omni-directional digital broadcasts probably don't go far.
But what about our focused beams from airport and weather radars?
- samus 4y agoThese beams are sweeping across the sky, therefore there will only be very brief windows of exposure for any observer in the sky. Since our planet rotates, in my lay opinion the chances are even lower that a target in deep space will get enough regular exposure to analyze even strong signals accidentally sent out from Earth. The Deep Space Network has to use three big rotating dishes to keep sending to and receiving from a direction in the outer solar system. These signals have been going for a long time now, therefore it might be a promising approach to focus SETI's resources on the stars where these signals might have ended up (more details in the article)
- poulpy123 4y agofocused beams have the same problem than the other ones, the power decrease in r^2.