Alternate Reality

Thesaurus.com gives the following words as a synonym for alternate:
backup
double
equivalent
fill-in
proxy
replacement
stand-in
sub
surrogate
And the following for reality:

I think to begin to understand this idea, one has to understand the words to describe it. There is little proof and lots of theories about this possibility, yet it is mostly labeled as science fiction, not true science. I believe that not only is it absolutely true, everyone has experiences of tapping into those other realities. Memory loss is certain for any traveler. When one returns they have only a few seconds of recall of where they went. It is near impossible to prove something you can't remember. Not only is it possible to travel to another universe, a person needs little do it. Death is most likely involved.