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The John Batchelor Show

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

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4.52.8K Ratings

🗓️ 10 December 2025

⏱️ 2 minutes

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Summary

s of the Hubble ConstantBob ZimmermanZimmerman 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 space. Zimmerman documents that the measurement crisis stems from irreducible conflicting empirical data: when astronomers measure the early universe using distant supernovae and cosmic microwave background radiation, they derive a lower expansion rate number, yet when they measure the near universeusing contemporary observations of local galactic clusters, they derive a significantly higher expansion rate number. Zimmerman emphasizes that this discrepancy does not result from imprecise or unreliable data; rather, both measurement methodologies have become increasingly sophisticated and accurate, yet the fundamental contradiction persists despite technological improvements. Zimmerman argues that the persistent contradiction between two highly accurate but incompatible numerical values indicates that "something is fundamentally wrong with the cosmology and the theories," suggesting that current scientific understanding of the Big Bang, cosmic evolution, and the universe's fundamental physical properties contains critical errors requiring radical theoretical revision. Zimmerman employs an analogy: if measuring a child's growth rate during their first year of life predicted they should be 4 feet tall, but contemporary measurement reveals them to be 5 feet tall, and both measurements are perfectly accurate, then the mathematical formula governing human growth is fundamentally flawed—similarly, the Hubble constant contradiction suggests current cosmological models misunderstand the universe's fundamental physics and evolutionary trajectory.
AUGUST 1958

Transcript

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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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