What fundamental aspect of the cosmos does the Hubble constant primarily serve as a yardstick for?

Answer

The scale, age, and expansion history of the entire cosmos.

The Hubble constant ($H_0$) is described as the fundamental yardstick used to measure the scale, age, and overall expansion history of the universe.

What fundamental aspect of the cosmos does the Hubble constant primarily serve as a yardstick for?

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What is the Hubble Constant? Daniel Holz measures the ... - YouTube

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