So the only ETI theory that I know of that fits the Q dops (maybe) would be the Contiguous Universe ETI that Edgar Mitchell wrote to John Podesta about repeatedly.

Fits: 'vastness of space' - Interstellar travel on our plane of existence breaks General Relativity.

Fits: 'Are we alone? No.' : ETI's exist in other dimension.

Sauce: https://wikileaks.org/podesta-emails/emailid/6983

https://wikileaks.org/podesta-emails/emailid/41591

https://wikileaks.org/podesta-emails/emailid/35713