An alien visit is most probably not in the cards, but we might very well be able to start listening in on a cosmic conversation going on between alien civilizations that have long ago establish two-way communication. They probably have not visited each other, but they could exchange ideas and scientific discoveries. The long lapses between question and reply would be frustrating, often arriving after the question has already been answered by the questioner, but occasionally arriving as a new insight.

Geognosticator