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What is Hubble's parameter/constant H0 supposed to mean, exactly?

The Hubble parameter is not a direct measure of how fast the universe is expanding; it is the ratio of the rate of expansion of the scale factor $a$ (can think of this as the distance between two ...
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What is Hubble's parameter/constant H0 supposed to mean, exactly?

Accelerated expansion means that a given galaxy recedes from us faster in the future than it does today. A decreasing Hubble rate $H$ means that for a set distance $d$, the recession rate of objects ...
Sten's user avatar
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