AI Summary
5 min readAt the moment the universe became transparent, it was not a sprinkling of stars against a black sky. It was a kiln. The entire cosmos glowed at 3,000 degrees Kelvin — the temperature of visible light — and there was nowhere to hide. As Neil deGrasse Tyson explains in this grab-bag edition of StarTalk, if you had tried to step into the shade of some primordial rock, that rock would have absorbed the ambient radiation and begun glowing at the same temperature, making it invisible. This is the same principle that thieves exploit in the film The Thomas Crown Affair: heat the room to match the walls, and infrared cameras see nothing but uniform glow. The cosmic microwave background we detect today as faint microwaves was once brilliant, white-hot light, stretched a thousand-fold by the expansion of the universe.
How to Tell Where One Universe Ends and Another Begins
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What you'll learn
- 1 (02:24) **Multiverse Boundaries & Bubble Universes** - Neil explains how different multiverse models work and whether we could detect neighboring universes
- 2 (07:56) **Favorite & Least Favorite Astrophysical Words** - Neil shares his chapter on astronomical jargon and picks winners and losers
- 3 (19:38) **Planetary Nebulae: A Naming Crime** - Neil vents about a historical misnomer that still persists
- 4 (21:34) **Project Starshot & Reaching Alpha Centauri** - Neil evaluates whether light sail technology can beat other propulsion methods to our nearest star system
- 5 (26:36) **The Problem with "Now"** - Neil explains why there is no universal "now" in physics
- 6 (29:37) **Gravity, Rubber Sheets & Higher Dimensions** - Neil clarifies a common misconception about the bowling-ball-on-trampoline analogy
- 7 (33:08) **Hoag's Object & Statistical Thinking** - Neil uses a ring galaxy question to discuss why our brains struggle with probability
+ Full timestamped outline available in the app
Guests on this episode
Show Notes
If the multiverse exists, where does our universe end and another begin? Neil deGrasse Tyson and comic co-host Chuck Nice tackle a wide-ranging grab bag of fan questions covering bubble universes, the nature of now, fractals, Hoag's Object, and more.
NOTE: StarTalk+ Patrons can listen to this entire episode commercial-free here:
https://startalkmedia.com/show/cosmic-queries-light-sails-quantum-scales/
Thanks to our Patrons Joan Kirk, Robert Roberts, Mike Holland, Manickore, Zaki Imani, Christopher Johnson, Seb, Annette Hinkle, Bruce Davis, Geoff Hansen, Matthew Binggeli, Michael Greer, steph, Jo, Laurie Rieman, Monneke King, TakeOffYourPantsAndJacket, Catharine Hula, John, Mike, Jordan Jefferson, Bruce, Burç Ayata, Armon Jackson, and Sami Röksä for supporting us this week.
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