Sir/Ma'am I had previously asked a question of "where exactly does the space expand into....."
I received an answer -if space was infinite it wouldn't be expanding into anything because it was already infinite ..
But( to the best of my knowledge),
i feel that I could simply rule out the space being infinite because-
If we had started with some amt of matter then to spread that in an infinite area we would require a density (of space) to be zero exactly , however we even in vaccum find some or the other form of atomic and/or subatomic "substance"....
You can object me by telling that we had started with an infinite amount of matter but then we should have a density of exactly 1 unit because -infinity by -infinity=1
Which is not the real case ..
What now ,is this some sort of a paradox

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Solution

This is a paradox question, the Universe isn’t expanding into anything, it’s just expanding.

The definition of the Universe is that it contains everything. If something was outside the Universe, it would also be part of the Universe too. Outside of that? Still Universe. Out side of THAT? Also more Universe. It’s Universe all the way down. But I know you’re going to find that answer unsatisfying, so now I’m going to break your brain.

Either the Universe is infinite, going on forever, or its finite, with a limited volume. In either case, the Universe has no edge. When we imagine the Universe expanding after the Big Bang, we imagine an explosion, with a spray of matter coming from a single point. But this analogy isn’t accurate.

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How does the author convince himself that the foot-print is a real one?

I chose to wander by Bethlehem Hospital; partly, because it lay on my road round to Westminster; partly, because I had a fancy in my head which could be best pursued within sight of its walls. And the fancy was: Are not the sane and the insane equal at night as the sane lie a dreaming? Are not all of us outside this hospital, who dream, more or less in the condition of those inside it, every night of our lives? Are we not nightly persuaded, as they daily are, that we associate preposterously with kings and queens, and notabilities of all sorts? Do we not nightly jumble events and personages and times and places, as these do daily? Said an afflicted man to me, when I visited a hospital like this, ‘Sir, I can frequently fly.’ I was half ashamed to reflect that so could I - by night. I wonder that the great master, when he called Sleep the death of each day’s life, did not call Dreams the insanity of each day’s sanity. Consider the following questions related with the above passage and answer them accordingly:

It can be correctly inferred that Bethlehem hospital-

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