What holds the universe together? Not the stars. Not the gas. Not anything we can see. Eighty-five percent of all matter in the universe is invisible — a substance we call dark matter. In this premiere episode of Unsolved Science, Dr. Sarah traces the history of one of physics' deepest mysteries, from Fritz Zwicky's ignored discovery in 1933 to Vera Rubin's galaxy rotation curves to the Bullet Cluster collision that proved dark matter is real. We examine the leading particle candidates — WIMPs, axions, and primordial black holes — the underground laboratories built to detect them, and the radical alternative theories that challenge everything we think we know about gravity.

CHAPTERS:
0:00 — Opening
0:10 — Cold Open: The Stars That Should Not Exist
1:30 — Welcome to Unsolved Science
3:00 — Fritz Zwicky and the Coma Cluster (1933)
8:00 — Vera Rubin and the Rotation Curves (1970s)
14:00 — How Much of the Universe Is Dark Matter?
16:00 — Evidence: Rotation Curves
17:30 — Evidence: Gravitational Lensing
19:00 — Evidence: The Bullet Cluster
22:00 — Evidence: The Cosmic Microwave Background
24:00 — What Is Dark Matter? WIMPs, Axions, Primordial Black Holes
26:00 — The Underground Laboratories
28:00 — Modified Gravity: MOND
29:00 — The Cosmic Web
30:00 — Twenty Twenty-Six and the Vera Rubin Observatory
31:00 — Closing Reflections and Next Episode Teaser

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Disclaimer: This podcast is intended for educational and informational purposes. Scientific understanding changes as new evidence emerges, and some topics discussed involve active areas of research with competing theories and unresolved questions.

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