His bet was that a more advanced civilization might be able to help them.

And in a lot of ways, they're a more advanced civilization than ours.

She'd tried to explain how advanced civilizations worked until she could feel herself turning blue in the face, and they still didn't understand!

No advanced civilization has yet learned how to endure without it.

So the most likely signal would come from a civilization much more advanced.

Or would the signature of a really advanced civilization be that they left no sign at all?

I guess that is the real sign of a truly advanced civilization.

"It's really hard to guess what an advanced civilisation might do."

Despite the best efforts of its people, the advanced civilization was ruined.

He'd seen stranger things, especially from an advanced civilization as this one had clearly been.