118 | Adam Riess on the Expansion of the Universe and a Crisis in Cosmology

118 | Adam Riess on the Expansion of the Universe and a Crisis in Cosmology

Astronomers rocked the cosmological world with the 1998 discovery that the universe is accelerating. Well-deserved Nobel Prizes were awarded to Saul Perlmutter, Brian Schmidt, and today's guest Adam Riess. Adam has continued to push forward on investigating the structure and evolution of the universe. He's been a leader in emphasizing a curious disagreement that threatens to grow into a crisis: incompatible values of the Hubble constant (expansion rate of the universe) obtained from the cosmic microwave background vs. direct measurements. We talk about where this "Hubble tension" comes from, and what it might mean for the universe.

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Adam Riess received his Ph.D. in astronomy from Harvard University. He is currently Bloomberg Distinguished Professor and Thomas J. Barber Professor of Physics and Astronomy at Johns Hopkins University and a Senior member of the Science Staff at the Space Telescope Science Institute. Among his many awards are the Helen B. Warner Prize of the American Astronomical Society, the Sackler Prize, the Shaw Prize, the Gruber Cosmology Prize, the MacArthur Fellowship, the Breakthrough Prize in Fundamental Physics, and the Nobel Prize.


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354 | Christian List on Free Will and Levels of Reality

354 | Christian List on Free Will and Levels of Reality

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353 | Alvin Roth on the Economics of Morally Contested Markets

353 | Alvin Roth on the Economics of Morally Contested Markets

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AMA | May 2026

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352 | Bing Brunton on Connecting the Connectome to the Body

352 | Bing Brunton on Connecting the Connectome to the Body

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351 | Peter Singer on Maximizing Good for All Sentient Creatures

351 | Peter Singer on Maximizing Good for All Sentient Creatures

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350 | J. Eric Oliver on the Self and How to Know It

350 | J. Eric Oliver on the Self and How to Know It

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AMA | April 2026

AMA | April 2026

Welcome to the April 2026 Ask Me Anything episode of Mindscape! These monthly excursions are funded by Patreon supporters (who are also the ones asking the questions). We take questions asked by Patre...

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349 | Daniel Harlow on What Quantum Gravity Teaches Us About Quantum Mechanics

349 | Daniel Harlow on What Quantum Gravity Teaches Us About Quantum Mechanics

There is something special about gravity. After decades of effort, there is still no convergence on the right way to reconcile Einstein's theory of general relativity with the framework of quantum mec...

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