Lots of theories, no provable answer is probably the best, although disappointing answer. Some theories seem more or less plausible than others.
In my humble opinion the simplest idea is there is a set amount of matter and energy, and if we ignore gravity, and lets not talk about the expansion of space for my simple example here, there is no obvious reason that matter and energy could not just keep moving along going further and further, resulting i space being infinite, but there is still that initial amount of energy.
Of course if I had all the answers case closed, I clearly don’t, this is just kind of a simple idea, and raises other questions such as how was the amount of matter and energy made in the first place? Why not 1% higher or lower, or 1000%?
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