Originally posted by sonship
Other universes is theoretical. No evidence of any other universes exists.
We really do not know if any other universes exist.
The one we know about is peculiarly indeed exquisitely calibrated to allow life to exist. The calibration is beyond, I said BEYOND extraordinary.
And I don't think the term Anthropic Principle was coined by Christians.
There actually is some evidence of other universes. The CBR shows hints of our universe, when it was much younger, may have had a bump from an external universe like two soap bubbles colliding and bouncing off.
They see definite signs of this in the background radiation:
And of course your cognitive dissonance will not be able to absorb such information. Too bad for you.
Nobody is saying this is the smoking gun of the presence of other universes. It is just a hint that things may be more than we think.
For instance, our universe is not infinite in size, maybe 50ish billion light years across and expanding but even at that enormous size, it is not infinite and other universes could possibly exist side by side of ours and maybe we will see evidence for more collisions on such a cosmic scale it boggles the mind.
If multiple universes exists, we may already be crunching into another one but don't know it yet. Or not. All this is speculation at this point but there is that evidence that shows something going on in the cosmic background radiation we can now study in details of less than one part in 1 millionth of a degree Kelvin. The first probe was able to see the CBR at about one part in a hundred thousand. The present probes are getting ten times the resolution of the first probes. They look for tiny variations in the temperature of the background which shows up a lot of the physics going on in the making of our universe.
That first probe was the COBE:
The second one was WMAP:
The newest one up there now: Planck probe:
Refining by a factor of 3 the data from WMAP.
This data tells us how much normal matter there is in the universe vs how much dark matter and so forth. It gives fundamental information about our universe and how it got here.