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How can the universe expand?

Answer 1

It just does. Its not a matter of how can the universe expand, but why the universe exists.

The universe is expanding faster than the speed of light, but this is not due to matter moving faster than light; rather, it is due to the distance between matter (which can be in the form of star systems, galaxies, or even individual clumps). Understanding the reason behind this expansion will help us understand why the universe can expand in the absence of any observable physicality.

I hope this clears up any confusion you may have. -C. Palmer

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Answer 2

Claire Anctil

The expansion of the universe is attributed to dark energy, which causes space to expand over time. The theory of cosmic inflation describes this expansion and is supported by observations like the redshift of distant galaxies.

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Answer from HIX Tutor

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.