Recent content by Mike Everman

Though there are higher frequency lasers we can make that are under 250nm, solidly in the UV band, that would avoid most of the emission spectrum of stars... Looks like UV telescopes are already on the job, but more for spectroscopy than looking for signals. https://astrosat.iucaa.in/node15

I suppose if I were to pick a frequency to both listen for, and broadcast at, it would be one suggested by, but not on the absorption bands of hydrogen, 410, 434, 486, and 656 nm. I think every intelligent species could agree on the most abundant signal absorber in the galaxy. I am not savant...

So the premise is that the folks in the Trappist system are either multi-planetary (more advanced than us, talking planet to planet), or communicating with spacecraft orbiting other planets (like us). In the first case, transmitter power is planetary size (and we have to assume less than an...