Just listened to AstronomyCast on Globular Clusters and enjoyed it so much! Fasinating stuff. I will never forget Charles Bonestell's painting of a planet just outside such a cluster. And Mr. Cain's speculations about a planet got me to thinking. (watch out!).

I realize that globular clusters are poor in metals (mm, are we talking real metals or those astrophysical metals - i.e. anything heavier than helium?) and probably did not have as much planet formation as say our local stellar neighbor but with the passage of time and the demise of the larger members, I wonder if earth-like planets have a chance to form from supernova remnants? What is the likelihood a planet like that would be captured and have a stable orbit in the cluster? What is the likelihood if it being in the "habitable" zone of a cluster member, as compared to stars on the disc of the Milky War.

If it is possible, I can imagine a civilization that could be billions of years old, but a long, long ways from us. But if you can find a stable, livable orbit there, it seems a great place to be safe for a long, long time! Maybe they are retirement communities for civilizations that have the since to survive a billion years or more.