If they're not too far away visible light eventually gets absorbed and scattered by dust that hangs between the stars so if they're very far away they might use infrared. Here's my question we think sending radio waves is kind of the you know as they used to say the bees knees because that's a way to communicate at a distance. But suppose a truly intelligent civilization found a much cleverer way to communicate with aliens of their own intellect and would rank us so far below that we're not even worth their interest. Is that possible? Well of course it's possible but you know it sounds like a call to inaction right because that's saying well look they may be using technology that's so