Sean Raven: Any alien civilization capable of space travel is going to be so advanced compared to us that their technology will not be recognizable. It seems kind of unlikely to me that extra terraceas would traverse space in something we would recognize as a ship. Imagine that any civilization that regularly crosses in to tell instter stellar distances would probably use some kind of wormhole technology or something we never even thought of yet. If you APs aren't alien ships, but it turns out that they're also not something mundane, like weather balloons and such, then do we have a third option, guesses as to what they may be? The pop one last question that we can go through it fast.