A Planet in our own Solar System ?

  A Planet in our Galaxy ?

  A Planet from a different Galaxy ?

  A planet in another dimension ?

  Another dimension of reality ?

  From inner earth ?

  Created by our own government-military ?

  Extraterrestrials from the Future ?

  Humans from the Future ?

  Americans Invading the world by going back in time?

  All of the above ?

  None of the above ?