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 so-called 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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