Radio signals do weaken and dissipate over time and space. Broadcast signals could fade into the cosmic microwave background in a few light years depending on their strength. The sci-fi trope of aliens picking up Earth tv and radio just isn't plausible.
replyAnd in that light, you're worried two blocks the size of a small car will get picked up on the alien's hyperspace scanners?
replyYet we spend tax dollars trying to do the same thing.
replyNo, we don't. If you're talking about SETI, that's looking at radio signals. If you're talking about killer asteroid early-warning detection, we generally don't have the capacity to reliably detect voyager-sized asteroids even in our own solar system, let alone in interstellar space.
replyI'm not, but other people seem to think it's a problem worth worrying about.
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