Yea, but they would have to blink a significant portion of their galaxy for us to notice. The top of our capabilities is indirect planet discovery. So alien ci

Yea, but they would have to blink a significant portion of their galaxy for us to notice. The top of our capabilities is indirect planet discovery. So alien civilization would need to affect ceartain stars on a scale that a planet does and make it look not natural, like prime number periods or something.