[rishirishi]

Yes. We don't have the means to know so. Just like fish in the ocean don't know we exist, but we know they exist.

[TravHatesMe]

This can't be answered with any conviction. By that logic, we can be apply this infinitely many times: from the aliens perspective, they are also not aware of other aliens that know about their existence

[unfunco]

It's aliens all the way up.

[tudelo]

Of course, this 'yes' is a pretty loaded 'yes' even if I agree it's a possibility...

[sanxiyn]

How do you know fish in the ocean don't know we exist?