Planetary Orbits, Cosmic Expansion, and the Nature of Nothingness In this thought-provoking Q&A episode of Space Nuts, hosts Andrew Dunkley and Professor Fred Watson tackle a diverse array of listener questions that delve into the intricacies of our universe. From the stability of planetary orbits to the enigmatic concept of nothingness before the Big Bang, this episode promises to enlighten and intrigue.
Episode Highlights:
- Planetary Orbits vs. Energy: Justin from Melbourne asks how planets maintain stable orbits around the sun without spiraling inwards. Andrew and Fred explore the negligible forces at play in interplanetary space, discussing the stability of planetary dynamics and the historical migrations of planets within the solar system.
- Expansion of Earth: Larry questions whether the Earth is expanding along with the universe. The hosts clarify that while space itself is expanding, the forces that hold the Earth together, such as gravity, prevent any significant changes at a local scale.
- The Concept of Nothingness: Mike from the UK raises a philosophical query about what existed before the Big Bang. Andrew and Fred discuss the implications of time and existence, examining the idea that time itself may have begun with the Big Bang and the theories surrounding this profound mystery.
- Projectiles in Space: Giles presents a fascinating "what if" scenario regarding the accuracy of firing solid metal projectiles from orbit. The hosts analyze the challenges of targeting and the influence of atmospheric conditions, drawing parallels with historical warfare and modern technology.

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