I am a young adult writer, and my current WIP involves parallel universes. My main character is from another universe. I have read about worm holes and black holes. Quite frankly, just when I think I am beginning to remotely comprehend I hit another brain cramp. I realize this is all theoretical. My questions: What sort of technology would his universe have to have to be able to penetrate our universe? What could put off enough energy to create a small black hole? How could they come through without pulverizing themselves? Faraday cages of some sort? Do you think they would be disoriented for a couple of days? What about a time warp? How long could they hold the black hole open, assuming they have whatever energy it is they need being advanced? Is it plausible that something catastrophic in our universe could effect another? I hope this is theoretically possible, since it is integral to my plot. Once here, they cause an EMP on a large enough scale to wipe out every power grid. What would they have to do to pull that off? It needs to be something that does not hurt the planet. Thank you for your time, and I really do appreciate any information you can give.