[lotus]

Civilization only progresses directly to it's ability to destroy it's self. When that point is reached it's gone.

Therefore, none wil exist much more advanced than us and to look in areas older than us is useless. Only new star systems should be looked at, but unfortunately, I think they look for more advanced older systems.

[garycooper]

Civilization only progresses directly to it's ability to destroy it's self. ... Therefore, none wil exist much more advanced than us and to look in areas older than us is useless.

I don't see how you can say these things as fact. We simply don't know such things for certain.