# Do We Need a New Theory of Gravity?

An episode of [The Joy of Why](https://invisiblenetwork.ai/podcast/1608948873), 29 Aug 2024, 42 min.

Audio: https://dts.podtrac.com/redirect.mp3/tracking.swap.fm/track/sblTq32fyWAjsHzze2LG/dovetail.prxu.org/5340/c85c41bb-dd30-44e8-833c-9444d18ad0b7/JOW_-_Massive_Gravity_FINAL_SEG_A.mp3

Observations of the cosmos suggest that unseen sources of gravity — dark matter — tug at the stars in galaxies, while another mysterious force — dark energy — drives the universe to expand at an ever-increasing rate. The evidence for both of them, however, hinges on assumptions that gravity works the same way at all scales. What if that’s not true? In this episode, theoretical physicist Claudia de Rham explains her work on an alternative explanation called “massive gravity” to host Janna Levin.

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