This question makes our heads spin! It’s a really tough one, even for astrophysicists. We know that the universe is expanding – galaxies are zipping away from each other – but it doesn’t seem to be expanding into anything.
Think of it like baking a cake. As the dough rises in the oven, it fills more space, but it’s not pushing against anything outside the baking pan. That’s kind of how the universe works. There’s no "outside" for it to expand into.
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