Will I be able to return to Earth?
Also, note that you are being transported to Earth, just in a different universe.
I'm The Doctor, and I stop the completion of the machines before they are built to prevent the gaining of immortality or tearing the fabric of spacetime.
You cannot tear the fabric of space-time. That is something from fiction. Go read up on string field theory and the 11 dimensions. We are not transporting you back in time in our same universe, this isn't "Back to the Future," this is real life. Now we have time for one more question.