How fast is the universe expanding? Two prominent approaches are finding different answers, propelling cosmology toward a crisis. Wendy Freedman, a renowned astronomer who has spent decades seeking the expansion rate, joins Brian Greene to discuss the latest thinking on this socalled Hubble Tension.

This program is part of the Big Ideas series, supported by the John Templeton Foundation.

Participants:
Wendy Freedman

Moderator:
Brian Greene

00:00 Introduction
02:40 Participant introductions
04:40 The History of Cosmic Expansion
9:40 Henrietta Swan Leavitt's Contributions to Cosmology
11:45 Cepheid variable
15:04 How did Hubble calculate Expansion Rate?
21:05 Modern Measurements of Expansion Rate
26:09 Determining Expansion rate using Microwave Background Radiation
28:30 Can We Resolve Hubble Tension?
31:46 James Webb Space Telescope's Impact on Expansion Rate
34:02 The Future of Cosmology
35:19 Credits

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