Why This Universe?

Why This Universe?

The biggest ideas in physics, broken down. Join theoretical physicist Dan Hooper and co-host Shalma Wegsman as they answer your questions about dark matter, black holes, quantum mechanics, and more. Part of The University of Chicago Podcast Network.

Episodes

September 29, 2025 31 mins

Our universe is expanding. But when physicists measure how fast this expansion rate is, they get two different answers. Hear what this crisis means from Nobel Prize winner Adam Riess.

For ask-us-anything segments and other exclusives, join us for just $3 a month on Patreon: https://patreon.com/whythisuniverse

Our merch is available here: https://www.shalmawegsman.com/why-this-universe

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Adam Riess recounts the moments of his Nobel prize-winning discovery that our universe is expanding at an accelerating rate, powered by a mysterious energy source called dark energy. 

For ask-us-anything segments and other exclusives, join us for just $3 a month on Patreon: https://patreon.com/whythisuniverse

Our merch is available here: https://www.shalmawegsman.com/why-this-universe

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We answer your questions. To listen to our backlog of ask-us-anything episodes for free, head to our Patreon, or join for $3/month to submit your questions: https://www.patreon.com/whythisuniverse

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To listen to our backlog of past ask-us-anything episodes for free, head to our Patreon, or join for $3/month to ask us questions: https://www.patreon.com/whythisuniverse

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Learn what exciting cosmology results and potential discoveries await us in 2025!For exclusive ask-us-anything episodes, join us for just $3 a month on Patreon: https://patreon.com/whythisuniverse. Our merch is available here: https://www.shalmawegsman.com/why-this-universe

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A discovery last year reveals our galaxy in a whole new light - except it's not light, it's neutrinos! Learn what this discovery can teach us about the Milky Way and beyond.For exclusive ask-us-anything episodes, join us for just $3 a month on Patreon: https://patreon.com/whythisuniverse. Our merch is available here: https://www.shalmawegsman.com/why-this-universe

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Is it possible that dark energy is not a constant, but rather is changing over time? Sean Carroll talks to us about how our understanding of dark energy evolved in recent history, and what is still left unknown.For exclusive ask-us-anything episodes, join us for just $3 a month on Patreon: https://patreon.com/whythisuniverse. Our merch is available here: https://www.shalmawegsman.com/why-this-universe

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October 14, 2024 37 mins
Dan and Shalma have a candid conversation about the state of dark matter research, and the ways the field has changed over the last few years.For exclusive ask-us-anything episodes, join us for just $3 a month on Patreon: https://patreon.com/whythisuniverse. Our merch is available here: https://www.shalmawegsman.com/why-this-universe

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Why does something exist, rather than nothing? Special guest Sean Carroll helps us explore this deep philosophical question.For ad free episodes and other exclusives, join us for just $3 a month on Patreon: https://patreon.com/whythisuniverse.Our merch is available here: https://www.shalmawegsman.com/why-this-universe

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September 2, 2024 39 mins
There has been some criticism of the process scientists use to check each other's work. Today we take a deep dive into peer review to determine how broken it really is.For ad free episodes and other exclusives, join us for just $3 a month on Patreon: https://patreon.com/whythisuniverse.Our merch is available here: https://www.shalmawegsman.com/why-this-universe

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Learn how Noether's profound mathematical theorem relating symmetries to conservation laws is deeply woven into the physics of the universe. Enjoy this rerun of an earlier episode as we take our summer break.For ad free episodes and other exclusives, join us for just $3 a month on Patreon: https://patreon.com/whythisuniverseOur merch is available here: https://www.shalmawegsman.com/why-this-universe

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July 1, 2024 40 mins
We explore the diverse world of stars in the universe, from those similar to our Sun to those totally unrecognizable.For ad free episodes and other exclusives, join us for just $3 a month on Patreon: https://patreon.com/whythisuniverseOur merch is available here: https://www.shalmawegsman.com/why-this-universe

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Today's episode is all about the star in our front yard - the sun. Learn how it came to be, how it has changed, and how will it change in the future.For ad free episodes and other exclusives, join us for just $3 a month on Patreon: https://patreon.com/whythisuniverseOur merch is available here: https://www.shalmawegsman.com/why-this-universe

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Hear how the search for exoplanets has developed, and what surprises it has brought so far.For ad free episodes and other exclusives, join us for just $3 a month on Patreon: https://patreon.com/whythisuniverseOur merch is available here: https://www.shalmawegsman.com/why-this-universe

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Today we hear from someone who bore witness to the so-called “November Revolution” of particle physics in 1974.For ad free episodes and other exclusives, join us for just $3 a month on Patreon: https://patreon.com/whythisuniverseOur merch is available here: https://www.shalmawegsman.com/why-this-universe

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April 29, 2024 35 mins
Pseudoscience can sometimes be hard to distinguish from the real thing. Today we discuss how philosophers of science have thought about this problem.For ad free episodes and other exclusives, join us for just $3 a month on Patreon: https://patreon.com/whythisuniverseOur merch is available here: https://www.shalmawegsman.com/why-this-universe

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April 15, 2024 43 mins
The first episode in a new mini-series on philosophical problems in cosmology - Today we start with the origins of Western science and learn what the ancient Greeks thought about the cosmos.For ad free episodes and other exclusives, join us for just $3 a month on Patreon: https://patreon.com/whythisuniverseOur merch is available here: https://www.shalmawegsman.com/why-this-universe

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Hear how a recent discovery of the motions of galaxies is changing how cosmologists are thinking about our universe.For ad free episodes and other exclusives, join us for just $3 a month on Patreon: https://patreon.com/whythisuniverseOur merch is available here: https://www.shalmawegsman.com/why-this-universe

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Last year, an experiment called NanoGRAV made a surprising discovery of gravitational waves using pulsars around the universe. Special guest Chiara Mingarelli explains.For ad free episodes and other exclusives, join us for just $3 a month on Patreon: https://patreon.com/whythisuniverseOur merch is available here: https://www.shalmawegsman.com/why-this-universe

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What's it like bringing science to the most general public audiences? How do you distill complex results into short news-worthy articles without getting lost in clickbait? Today we hear the perspective of New York Times science journalist Katrina Miller.

For ad free episodes and other exclusives, join us for just $3 a month on Patreon: https://patreon.com/whythisuniverse

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