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Space Nuts: Vanishing Stars, White Holes, Earth’s Mass and Neutrinos
In this listener Q&A episode of Space Nuts , Andrew Dunkley and Professor Fred Watson tackle four cosmic questions that stretch from distant stars to the nature of space-time. They explain why a star billions of light-years away would still appear in our sky long after it had gone out, and why looking across the universe means looking back through time. Next, they consider whether white holes are the opposite of black holes, then investigate whether dark matter could affect our measurements of Earth’s mass and gravity. Finally, they explore how neutrinos interact with gravity, whether black holes can capture them, and why space-time itself is not something a black hole can consume. Join Andrew and Fred Watson Watson for big ideas, listener curiosity and the occasional detour into the value of the Earth in dollars.
Key topics
- How light-travel time means we see distant stars as they were in the past.
- White holes as theoretical solutions to relativity, and how they differ from black holes.
- Whether dark matter contributes to Earth’s measured gravity and mass.
- The mass of the Earth and how astronomers determine it.
- Neutrinos, gravity, black holes and whether space-time can be consumed.
Timestamps
00:00 - Introduction and listener questions
01:30 - If a distant star goes out, when would we see it happen?
06:30 - Looking back in time across the observable universe
10:00 - What are white holes, and are they the opposite of black holes?
15:30 - Could dark matter affect measurements of Earth’s gravity?
20:30 - How the mass of Earth is determined
23:30 - Do neutrinos interact with gravity, and can black holes capture them?
27:00 - Could a black hole feed on space-time itself?
30:00 - How to send questions to Space Nuts and closing remarks
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Episode link: https://play.headliner.app/episode/36122919?utm_source=youtube