so are there any em spikes coincident with the transit of each planet? I mean if there was a civilization broadcasting into space with analog, we might hear them. And since they are using radio, we can be pretty sure they would be technologically inferior to us and unlikely to come over and eat us if we said hello.
It's so expensive in energy to do this that it's unlikely.
Even the moon, if it was made of gold bars stacked at the ready to be picked up and brought back to Earth, it wouldn't be worth it.
Even if you had technology to transport a significant force across the span of light years, why endanger that with the risk of resistance? Just go to one of the billions of habitable planets that don't have complex, radio transmitting intelligences on it.
Why would there be a spike with the transit of the planet? You still have line of sight to the planet before and after. What should be detectable is a drop in EM when the star is in front of the planet, but good luck discerning it from the noise of the star.
Kind of unrelated, but Ultra Wideband [0] is a way to communicate with quick electromagnetic pulses over big parts of the EM spectrum, which is indistinguishable from noise [1]. We could just be the only beings stupid/unlucky enough to make all our radio communication so obvious.
