Noone knows but they do keep finding more and more of it. At some point we might have to develop different instruments to allow us to measure larger spaces.
Mathematically? It is not infinite but the universe is far, far larger than anything we can imagine, so for all practical purposes, it might as well be! Infinity is quite weird. You can google ‘Hilbert’s hotel’ and see how weird it is. There are some good articles and youtube videos that use Hilbert’s hotel to explain infinity.
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Edward commented on :
Mathematically? It is not infinite but the universe is far, far larger than anything we can imagine, so for all practical purposes, it might as well be! Infinity is quite weird. You can google ‘Hilbert’s hotel’ and see how weird it is. There are some good articles and youtube videos that use Hilbert’s hotel to explain infinity.