Let me tell you the reality of our existence. There was a creature which roamed all alone. When he aquired all the knowledge that was possible, then he created different lifeforms of different intelligence and assigned them on various planets, created enough support for those lifeforms so they could sustain. Now that creature maintains all these planets and amuses himself by playing with them. Occassionaly he transfers his creations between these planets and tries to amuse himself by seeing reactions of his creations.

As far as science is concerned, its yet in its infancy. There are many hidden and unknown things about our own universe unresolved. It is more likely to get jolted by peculiar things when we will be able to travel in inter-galatic worlds.