StarTalk Radio Quantum Quandary: StarTalk Live! With Brian Greene & Janna Levin
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Jun 3, 2025 
Brian Greene, a renowned theoretical astrophysicist and string theorist, joins Janna Levin, an expert in black holes and cosmology, alongside comedian Hasan Minhaj. They celebrate a century of quantum physics and dive into mind-bending topics. The discussion traverses dimensions, cosmic expansion, and the Hubble constant, blending humor and scientific insights. They ponder the relationship between quantum mechanics and general relativity, unraveling the mysteries of the universe while inviting listeners to rethink their perception of reality.
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Discovery of Other Galaxies
- The 1920s revealed the universe extends beyond the Milky Way as other galaxies exist.
- Edwin Hubble's discovery using Cepheid variables proved these 'spiral nebulae' are separate galaxies far away.
Universe Expansion Explained
- Hubble showed the universe is expanding as galaxies recede in all directions.
- The farther a galaxy, the faster it moves away, indicating space itself is stretching.
Origins of the Big Bang
- Reversing cosmic expansion implies a dense, hot beginning called the primeval atom.
- This concept became the Big Bang theory, describing a universe starting from one point.