[devane617]

I don't know why everyone seems to dwell on time travel when several parallel universes could exist within the speed of light. Lets say we co-exist with a universe that is speeding at 10,000 time our universe, or 10,000 slower. We could all occupy the same space and never bump into each other, yet still remain well within the bounds of the speed of light.

[Feiny]

If TERMINATOR can do it, so I can I!!!

[RegulatorCountry]

"We could all occupy the same space and never bump into each other, yet still remain well within the bounds of the speed of light."

We're a self-absorbed lot. Out of sight, out of mind.

[RightWhale]

The idea that gravity is leaking out of our universe into a nearby universe is still awaiting laboratory confirmation. The idea might not work out, most don't, but multiverses are entering the domain of public discourse. It's practically mainstream cosmology already.