Ian Sample
speaker
1,923 appearances
27 recordings
3 series
first heard Apr 2026
last heard 5d ago
Ian Sample’s voice in public audio — every appearance, attributed to the second.
Trend
recordings per month · last 12 monthsRecordings per month over the last 12 months — 27 in all, peaking in Jun 2026 with 8.
Appearances
You can obviously listen to the new series of Black Box Now.
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Uh it's all it's what half of it's gone live today?
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It's actually all live right now.
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And of course Science Weekly um wherever you get your podcasts.
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Thanks for coming.
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Dark matter is this mysterious, invisible substance that seems to clump around galaxies.
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Now, it doesn't emit, absorb or reflect light or any other electromagnetic radiation.
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That makes it really difficult to see.
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It's invisible, but it makes it also very hard to detect.
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And the way we really know about dark matter is through observations of the sort of gravitational effects it has on other things.
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And what we can tell is that dark matter seems to form this... It's often called a cosmic web.
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It sort of seems to form a kind of structure for the universe, okay?
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Now...
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Two people who are really key in getting some understanding of dark matter out there.
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The first is a guy called Fritz Zwicky.
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He was a Swiss-born astronomer.
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And in 1933, he started looking at clusters of galaxies.
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And he noticed that there wasn't enough visible matter in these clusters of galaxies to prevent the galaxies from just flying apart.
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And he said, oh, maybe there's this stuff called, he called it dunkle materiae.
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That didn't have a massive impact at the time.
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Showing 261–280 of 1,923 · page 14 of 97
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