>>11909983>The same goes for electromagnetic wavesTechnically yes. The question is what kind of loss do you have. After a certain distance radio broadcasts are going to become garbled just because of destructive interference and diffraction from dust and gas and all the other noisy EM emitting shits.
If you want to broadcast on galactic ranges without repeaters set up then you're going to need very high energy parts of the spectrum which means blasting x and gamma rays across space and hoping Romulax VIII isn't taking the kids to space disney that weekend and wandering head first into your artificial GRB.
Theoretically gravity waves would work but you're having to goof off with retardedly huge energy requirements or sensors so precise that it could detect a mouse farting on the moon.
