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How do we know the universe is expanding faster?

Answer 1

See below

The distance to the furthest visible celestial bodies gives us an idea of the size of the universe; if these bodies are moving away from us faster than before, we can conclude that the universe is expanding faster.

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Answer 2

Clara Avalos

Astronomers can calculate the rate of expansion of the universe, called the Hubble constant, which has been found to be increasing over time, by making observations of distant galaxies using techniques like measuring the redshift of their light and observing Type Ia supernovae.

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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.