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What is the Hubble constant essentially a measure of?

Answer 1

Recession (expansion) speed of the space in-between two galaxies.
As of now, the Hubble constant is nearly 71 km/sec/mega parsec.

A quasar is what appears as a point source of light, in a far distant

galaxy. Perhaps, it is the Black Hole of the galaxy. Measurements

reveal that this source is receding from the Earth (of the

galaxy Milky Way). This is how Hubble constant is estimated. A

generalization,based on recession of different quasars from Milky

Way, leads to the notion of expansion of our universe.

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Answer 2

Christopher Ales

In essence, the Hubble constant represents the speed at which the universe is expanding.

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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.