It's not out of the realm that if intelligent alien life exists, they might have located us with their massive telescopes and know about our existence as well. We do the same thing, with our ability to detect potential habitable planets. They might have telescopes equally as powerful and with methods to determine that intelligent life exists here (e.g. satellite orbits, light pollution, etc.). They could also be listening to radio broadcasts we emit from our location.
The universe is vast but even we have the technology to go looking for stuff and listen in. It would stand to reason other life could potentially be doing the same thing.
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