> Is there enough time in the lifetime of a star to build and use those structures? It's built in centuries, a star lived for billions of years (a few live for

> Is there enough time in the lifetime of a star to build and use those structures? It's built in centuries, a star lived for billions of years (a few live for only hundreds of millions, but that's still enough). Your other questions assume literal aliens would behave on the exact way you expect them to. That's not a sane assumption.