Corey Powell: Fate of the Universe

By Dilip -
What determines our fate? To the Stoic Greek philosophers, fate is the external product of divine will, ‘the thread of your destiny’. To transcendentalists such as Henry David Thoreau, it is an inward matter of self-determination, of ‘what a man thinks of himself’. To modern cosmologists, fate is something else entirely: a sweeping, impersonal physical process that can be boiled down into a single, momentous number known as the Hubble Constant.

The Hubble Constant can be defined simply as the rate at which the Universe is expanding, a measure of how quickly the space between galaxies is stretching apart. The slightest interpretation exposes a web of complexity encased within that seeming simplicity, however. Extrapolating the expansion process backward implies that all the galaxies we can observe originated together at some point in the past – emerging from a Big Bang – and that the Universe has a finite age. Extrapolating forward presents two starkly opposed futures, either an endless era of expansion and dissipation or an eventual turnabout that will wipe out the current order and begin the process anew.

That’s a lot of emotional and intellectual weight resting on one small number. Both the retrospective and the prospective interpretations of the Hubble Constant have stoked ongoing controversy in the 90 years since Edwin Powell Hubble published the first definitive evidence of an expanding universe in 1929. Recently, the controversy has taken on yet another guise, as increasingly precise techniques for measuring the expansion rate have begun to yield distinctly different predictions. The discrepancy has cosmologists wondering whether they are missing important elements in their models of how the Universe evolved from the Big Bang to today....
https://aeon.co/essays/how-they-pinned-a-single-momentous-number-on-the-universe

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