My interest leans more towards space opera than hard science fiction, but I'm aware that I can't completely ignore the universe as we know it. A question that has intrigued me lately is: "Are there really new elements and materials to be found in the galaxy, or are we going to find the same elements in any star system in the galaxy that we find here? The example from science fiction that immediately comes to mind is the dilithium crystal from Star Trek. Why would these things be found in other parts of the galaxy and not here? What would be the engine for creating the crystals in another part of the galaxy and not here? I'm not enough of a Trekkie to know if this dilemma has ever been dealt with by the fan base. The hypothesis that I have been playing with is that a white-hole incident happened in a different part of the galaxy, and the ejecta from that incident became part of the planetary structure in the star systems surrounding where the incident took place. I have no intention of writing up a paper on this subject for review from real physicists, but it seems a plausible explanation from a science fiction basis. Your thoughts and input would be appreciated.