Questions tagged [theories]

Questions regarding models proposed that can solve problems.

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Do we know what happens at the boundary of the universe, what are some theories about it? [duplicate]

Do we know what happens at the boundary of the universe, what are some theories about it? Does space time differ at the boundary? Do things become larger at the boundary? Do the trajectories curve and ...
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What covers the outside of the Universe? [closed]

Is the Universe a sphere with water or ice surrounding its' confinement? Are there any theories that imply the Universe being confined within a sphere of water/ice material?
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What happens if a black hole is produced inside another black hole?

Similar question here. The question I linked got me thinking. It is known that a black hole doesn't let anything escape its event horizon, not even light. Thus, naturally, anything that passes the ...
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Possible scenarios for life in the death of open universe possible?

Say, let's suppose the universe ends in an open universe, with the Universe expanding, but not going to such an extent that the big rip theory will take place. Obviously, the only things left would be ...