I believe that there are an uncountable number of universes. Why would ours be the only one? Our entire universe could be the like an atom in a whole bigger universe we would have no way of knowing.
Beyond the known universe
Here are a few options for you to choose :
1. Vacuum
2. Undiscovered subatomic particles
3. Vacuum with a low quantity of anti-matter
4. A new atmosphere breaking the laws of physics
5. It doesn't exist (If you believe Big Bang isn't real)
More universes I think. There's not one of anything in nature. Either that or there is no beyond the universe.
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I thought this would be an interesting topic to discuss. What is beyond the known universe? Any thoughts? Keep it religion free.