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.


Jaksot(423)

351 | Peter Singer on Maximizing Good for All Sentient Creatures

351 | Peter Singer on Maximizing Good for All Sentient Creatures

Peter Singer has been an influential philosopher for a number of decades. He was a significant early voice in animal rights, has been a leading thinker of utilitarianism, and helped inspire the effect...

20 Huhti 1h 15min

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

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

We are more familiar with ourselves than with anything else in the universe, but we generally don't come very close to really understanding what our "self" is. That's not too surprising, as selves are...

13 Huhti 1h 21min

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...

5 Huhti 3h 46min

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...

30 Maalis 1h 25min

348 | Jessica Riskin on Jean-Baptiste Lamarck and Life as Creative Agency

348 | Jessica Riskin on Jean-Baptiste Lamarck and Life as Creative Agency

"Lamarkism" is a term often attached to a seemingly discredited idea in evolutionary biology: that one organism could acquire characteristics (e.g., becoming stronger through exercise) that would then...

23 Maalis 1h 15min

347 | Andrew Guthrie Ferguson on How Your Data Will Be Used Against You

347 | Andrew Guthrie Ferguson on How Your Data Will Be Used Against You

In the 18th century, philosopher Jeremy Bentham suggested the Panopticon as a model of a prison where inmates could be constantly observed by just a single prison guard. Although his original idea was...

16 Maalis 1h 8min

346 | Erica Cartmill on How Human and Animal Minds Think and Play

346 | Erica Cartmill on How Human and Animal Minds Think and Play

Intelligence is a many splendored thing, especially when it comes to comparisons between species. Chimpanzees are better than humans at some numerical tasks, but less good at understanding what number...

9 Maalis 1h 28min

AMA | March 2026

AMA | March 2026

Welcome to the March 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...

2 Maalis 3h 53min

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