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Why is Hubble's constant uncertain?

Answer 1

What Hubble uses is redshift for determining expansion, but the redshift can also be caused by galactic collapse.

Redshift, the displacement of spectral lines toward longer wavelengths (the red end of the spectrum) in radiation from distant galaxies and celestial objects, means that we can't always tell how accurate redshift is in determining expansion.

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Answer 2

Leah Abbate

Variations in measurements, disparities in observational techniques, and differences in data interpretation all contribute to the uncertainty surrounding Hubble's constant. Moreover, measurements are constantly changing as a result of ongoing technological advancements and observational technique improvements.

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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.