To scale it up, if you're an intergalactic entity, all you'd have to do is make a note of objects pulsing/resonating where they were not before. "Oh, looks lik

To scale it up, if you're an intergalactic entity, all you'd have to do is make a note of objects pulsing/resonating where they were not before. "Oh, looks like Earth just got radio waves, which means there's probably life there." From there you just monitor the wave Hertz output by the planet, and when they start transmitting waves at higher Hz, you know it might be time to meet up. "Oh they're sending photonic gamma rays as messages now instead of radio waves, I'm gonna go say Hi."