If space isn't part of the Universe, what is the Universe expanding into?
There is nothing required for the universe to expand into, because all space and time - any reality that we know of - is coming into existence as the universe expands.
It is a common misconception to think that there is something larger than the universe, and that the universe is expanding into it (perhaps to fill it at some point?).
Current belief is that time and space came into existence at the moment of the Big Bang, and that as a result, there was no such thing as "before the Big Bang". In much the same way, there is no such thing as "beyond the universe".
One of my favourite Stephen Hawking quotes is this one:
"Although the universe doesn't have an end, it had a beginning in the Big Bang. One might ask what is before that but the answer is that there is nowhere before the Big Bang just as there is nowhere south of the South Pole."
Likewise, there is nowhere outside the universe.
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The universe is expanding; it is not expanding into anything external; rather, it is expanding the metric of space itself, pulling galaxies apart from one another. The universe is not expanding into anything external; rather, it is expanding the spatial fabric itself.
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When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.
When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.
When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.
When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.
- Why is the temperature of the cosmic background radiation not perfectly isotropic?
- What wavelengths of the electromagnetic spectrum are utilized by plants for the purpose of photosynthesis?
- What came before the Big Bang?
- What is the size of the observable universe? How do scientists know how big the invisible portion is if they can't see it?
- What is the size of the observable universe?
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