S8 Ep183: s of the Hubble Constant — Bob Zimmerman — Zimmerman outlines a fundamental crisis in cosmological understanding regarding the Hubble constant, the astronomical parameter measuring the rate at which the universe is systematically expanding across time and
The John Batchelor Show
John Batchelor
4.5 • 2.8K Ratings
🗓️ 10 December 2025
⏱️ 2 minutes
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AUGUST 1958
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| 0:00.0 | This is John Batchel. |
| 0:01.9 | A wonderful conversation with colleague Bob Zimmerman about the Hubble Constant. |
| 0:07.0 | What it is and why we've got a problem with it, because right now we're measuring early |
| 0:12.9 | universe and later universe. |
| 0:14.9 | We're measuring everything again, looking at everything again because of the James Webb |
| 0:19.2 | Space Telescope. |
| 0:20.5 | Everything's up in the air. |
| 0:22.4 | Nothing's quite working, like galaxies that shouldn't have formed that early on after the Big Bang. |
| 0:29.6 | And now the Hubble Constant has a problem. |
| 0:32.0 | Good, accurate details, but the early universe and the later universe. |
| 0:36.7 | Well, Bob will explain. |
| 0:38.5 | It's not good that they don't match. |
| 0:41.2 | Here's Bob Zimmerman. |
| 0:42.3 | Much more of this in weeks to come. |
| 0:45.3 | We have a problem. |
| 0:48.9 | Here's Bob. |
| 0:50.5 | All right, well, the Hubble constant is named as the same thing the Hubble Space Telescope is. |
| 0:56.0 | Edward Hubb, an American scientist astronomer from the early 20th century. |
| 1:00.5 | He determined that the universe was expanding, and it was expanding at a rate that was not certainly known in the past, but nonetheless, the space between the stars |
| 1:14.5 | was actually stretching apart. That's what he discovered, that galaxies are flying away from each |
| 1:19.6 | other. The problem for scientists and astronomers now for a century is determine exactly what |
| 1:25.7 | that expansion rate is. |
... |
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