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The Crisis in Cosmology

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January 24, 2019

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The search for a single number: the hubble constant, which is the rate of expansion of our universe, has consumed astronomers for generations. Finally, two powerful and independent methods have refined its measurement to unprecedented precision. The only problem is that they don’t agree. This calls into question some of our most basic assumptions about the universe.

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Previous Episode: Why String Theory Is Wrong

Hosted by Matt O'Dowd

Written by Matt O'Dowd

Graphics by Luke Maroldi

Directing by Andrew Kornhaber

In 1929, Edwin Hubble discovered the universe. He gave us our first incontrovertible proof that there are galaxies outside the Milky Way by measuring the distances to the spiral nebulae. They were many millions of light years from us –far outside the Milky Way and so must be galaxies in their own right. Combined with the Doppler-shift velocity measurements of Vesto Slipher, Hubble revealed that the galaxies are not only receding from us, but they are receding at a rate proportional to their distance.

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PBS Member StationsPatreon TheReddit HelpMatt O'Dowd WrittenMatt O'Dowd GraphicsLuke Maroldi DirectingAndrew Kornhaber InEdwin Hubble

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