Due to curiosity, it made me wonder what is outside of the universe, is it a new chemical or just empty space?
But empty space have protons appearing and disappearing in it, it basically still has something in it.
(It might have something to do with string theory.)
Answer
The universe isn't expanding "into" anything, it's the space itself that is expanding, or "stretching" if you will! Besides, it's the space between the galaxies that's expanding mostly. Inside them, gravity is overcoming the expansion, so it's really only on the larger scales.
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