Yes Virginia, there are other worlds
First of all, yes. There are other worlds. Many of them. Possibly an infinite number of them. Most of the old database was dedicated to all of our data on these other worlds. See, it's possible that we could be invaded or have refugees from those worlds so it was important to keep tabs on them. Now however, we just don't have the data. What data we do have is woefully outdated. I'll try to outline what we do know.