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Astrophysicist Neil deGrasse Tyson and Chuck Nice discuss stillness in the universe, humans on Mars, and selecting music for the Voyager Golden Record. Topics include strength differences on Mars, 3D printing in space travel, absolute stillness in quantum physics, and the behaviors of particles in black holes.
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Quick takeaways
- Spiral galaxies maintain shape through differential rotation triggered by spiral density waves.
- Black holes emit X-rays as gas clouds spiral towards them, aiding in detection through X-ray telescopes.
Deep dives
The Dynamics of Galaxy Spirals
Spiral galaxies like ours and Andromeda are not being sucked into black holes but maintain their shape due to differential rotation. The spiral arms are caused by spiral density waves triggering star formation, moving gas clouds in coherent patterns, as the galaxy rotates.
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