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This episode originally aired in 2024.
Cosmic Q&A: Gravity, Energy, and Hidden Galaxies
In this thought-provoking holiday repeat episode of Space Nuts, hosts Andrew Dunkley and Professor Fred Watson dive into listener questions that explore the intricate relationships between gravity, energy, and the cosmos. With inquiries from Steve, Gus, and Nick, the discussion spans the nature of gravity, the implications of energy on gravitational fields, and the mysteries of galaxy movements.
Episode Highlights:
- Gravity Without Mass: Steve from New Zealand poses a fascinating question about the possibility of gravity existing without mass. Andrew and Fred discuss the theoretical implications and whether energy can contribute to gravitational effects, referencing concepts like thermal energy and dark matter.
- Energy and Gravity: Gus from Jessica, Washington, raises an intriguing point about the equivalence of mass and energy and its relationship to gravity. The hosts navigate the complexities of gravitational energy and ponder whether the energy of gravitational fields could influence mass.
- Hidden Galaxies: Nick from Auckland, New Zealand, wonders if there are early galaxies moving towards us that we can't yet see. The discussion delves into the concepts of redshift and peculiar motion, clarifying how the expansion of the universe affects our observations of distant galaxies.
- Listener Engagement: The episode wraps up with Andrew and Fred encouraging listeners to keep sending in their questions, fostering a sense of community and curiosity about the universe.
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Stay curious, keep looking up, and join us next time for more stellar insights and cosmic wonders. Until then, clear skies and happy stargazing.

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