>Their entire system is designed around the assumption that radio waves are going to be the way these advanced civilizations communicate. Yes, but don't think

>Their entire system is designed around the assumption that radio waves are going to be the way these advanced civilizations communicate. Yes, but don't think of it like Sweet 98's greatest hits. SETI specifically looks in the hydrogen frequencies because they're less noisy. This goes with the assumption that if they're at least as smart as us, they'll have similar astrophysics knowledge, and therefore know that a radio signal there would be easier to pick out against background.