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What is the expanding universe theory?

Answer 1

In a nutshell galaxies are receding from each other as evidenced by the red shift of spectral lines of distant galaxies.

In other words, the Universe is not expanding; rather, as evidenced by Hubble's theory, the Universe is finite, even though it is unbounded.

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Answer 2

Elena Antonova

The Big Bang theory, also referred to as the expanding universe theory, postulates that the universe started as a singularity and has been expanding ever since. It is backed by observations such as the cosmic microwave background radiation and 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.