
In Our Time The Moon (Archive Episode)
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Nov 6, 2025 Join Paul Murdin, Visiting Professor of Astronomy, who brings insights on lunar dynamics, and Caroline Crawford, Gresham Professor of Astronomy, who delves into the Moon's cultural significance. They explore lunar cycles used for prehistoric timekeeping and how the Moon influences Earth’s tides. Ian Crawford, an expert in planetary science, discusses the Moon's geology and formation theories, including the Giant Impact hypothesis. The potential for water resources and colonization sparks fascinating debates about humanity's future on our celestial neighbor.
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Earth–Moon Twin System
- The Moon is large enough relative to Earth that the pair functions like a twin-planet system rather than a tiny satellite.
- The Moon keeps the same face toward Earth because Earth's gravity has tidally locked its rotation.
20,000-Year-Old Lunar Records
- Archaeological bones dated ~20,000 years old show scratched cycles of 29 marks tracking lunar phases over months.
- These marks suggest early humans recorded lunar cycles for navigation or fertility timing.
How Lunar Tides Work
- Tides arise because the Moon's gravity pulls more strongly on near-side water than on the Earth below, creating a bulge that follows the Moon.
- A second opposite bulge forms because Earth is pulled more than far-side water, producing two daily tides.


