UFO's and extra-terrestrial life

[unreasonable]

Originally Posted by Wolf_Rider

parallel universes exist in parallel to this universe, not as mathematical objects in this universe though

Untestable empirically.
Not provable mathematically or logically.
Might be a useful philosophical or mathematical tool in some respects, but then so are counterfactuals, which are also untrue.
Confuses the civilians.

All in all it would be better if you left the word "exists" to its normal use (you know, for things that actually do exist like flight-simmers, kittens and the idea of possible parallel universes) and instead used the world "grolphs".

Then you could say "parallel universes grolph in parallel to this universe, not as mathematical objects in this universe though"