The Elephant in the Universe: 100-year search for dark matter Author: Govert Schilling The Big Bang's Clues: Non-Baryonic Matter and Failed Candidates
The John Batchelor Show
John Batchelor
4.5 • 2.8K Ratings
🗓️ 7 September 2025
⏱️ 11 minutes
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Summary
The Big Bang's Clues: Non-Baryonic Matter and Failed Candidates
Headline: Cosmic Evolution Demands New Matter; Neutrinos Fall Short
The universe's evolution from the smooth, hot state after the Big Bang to its current clumpy structure of galaxies and clusters requires far more gravity than visible matter can provide. Everything we know, from atoms to stars, is classified as baryonic matter. However, the nature of dark matter must be different; it cannot be composed of atoms and is thus termed non-baryonic matter. In the early 1970s, Albert Bosma used radio telescopes to observe hydrogen gas far beyond visible galactic edges, confirming the widespread anomalous rotation curves found by Rubin and Ford. Early dark matter candidates included neutrinos, but their light, fast-moving nature ("hot dark matter") meant they would clump on vast scales first, contradicting observations of early small clumps. This led to the conclusion that dark matter must be "cold" and slow-moving.
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| 0:25.9 | This is CBS. |
| 0:26.7 | I am the world. |
| 0:28.4 | I'm John Batchel with Govert Schilling, |
| 0:30.6 | his wonderful new book, The Elephant in the Universe, |
| 0:33.0 | 100-year search for dark matter. |
| 0:36.2 | And also his travels and his conversations with astronomers and researchers in deep minds, |
| 0:41.2 | in the beautiful Chile, high desert of Chile, and also back in time, |
| 0:47.1 | Grover's going to take us to the Big Bang and why it is that that's important to make part of the search for dark matter. |
| 0:55.4 | What happened in the first moments? |
| 0:57.0 | How can we imagine it, covert? |
| 1:00.0 | It's an extremely complicated topic, but we see now that space is expanding |
| 1:04.5 | because all the galaxies get farther and farther away from each other. |
| 1:08.7 | So the empty space between galaxies is expanding. |
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