Although the Hubble constant appears to be a constant, it is not really a constant.
Is the Hubble constant decreasing over cosmological timescales?
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2$\begingroup$ @BobBee You're thinking of the cosmological constant. The Hubble parameter has a complicated behaviour over time, viz. the Friedmann equations. $\endgroup$– J.G.May 15, 2017 at 7:15
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$\begingroup$ Possible duplicates: physics.stackexchange.com/q/136056/2451 , physics.stackexchange.com/q/18301/2451 , physics.stackexchange.com/q/69050/2451 and links therein. $\endgroup$– Qmechanic ♦May 15, 2017 at 11:02
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1$\begingroup$ Possible duplicate of How does the Hubble parameter change with the age of the universe? $\endgroup$– ProfRobMay 15, 2017 at 11:36
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$\begingroup$ @J.G.Thank you for pointing that out. Definitely thought it was about the cosmological constant. And definitely and totally agreee the Hubble parameter is a significant functon of time. Deleting my previous comment, I absolutely misread the question. $\endgroup$– Bob BeeMay 15, 2017 at 18:02
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