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Why are galaxies moving away from us?

Answer 1

Universe is expanding from the time of Big bank.

AS the universe expands Galaxies get away from each other.
Latest studies says that the acceleration of universe is increasing due

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Answer 2

Hunter Arthur

The expansion of the universe is what causes galaxies to appear to be traveling in all directions away from us; this phenomenon is called the "Hubble flow," named after the astronomer Edwin Hubble who first observed it. Dark energy, a mysterious force, is the driving force behind the universe's expansion, stretching space and carrying galaxies away from one another.

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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.