Well, the general consensus is that once a civilization reaches Type 2 status(the level at which they might start engineering other life forms in other star systems), said civilization would be a stable enough and widespread enough that a "local" disaster like a supernova or black hole formation while a major disaster, would be like a flood or Cat 5 hurricane, something regional to be dealt with and then avoided/forgotten.
For Reference, Modern Man is Type 0, though some would assign a 0.5 or 0.75 rating, and the Federation from Star Trek is a middle grade type 1. The Old Republic is a high grade Type 2. The Ancients from Star Gate, before they're ascension, would be a Type 3.
By Type X, I mean on the Kardashev scale, which used to be 5 generals types I thought. Anyway, said scale measures a civilization 's technological prowess and development based on they're energy usage on a species level.
As far as sources, there is a megalith, I think in central Mexico that is what I am thinking of, but the name eludes me atm. It might be in South America somewhere. I recall that it is very near another site that is mostly intact and is a tourist attraction, whose name also eludes me atm. Don't get old, the memory is the first thing to go.
