Neil deGrasse Tyson | This Past Weekend w/ Theo Von #683

Episode Overview

• Astrophysicist Neil deGrasse Tyson joins Theo Von (with off-camera research by producer Nick) to explore how the laws of physics, evolutionary biology, and a cosmic perspective shape our understanding of the universe, our technological future in space, and our tribal behaviors on Earth.
• The conversation bridges massive cosmic scales—from the 864,000-mile-wide Sun to the 400 billion stars in the Milky Way—with the microscopic complexity of the human brain, chiral chemistry, and the periodic table.
• Tyson and Von examine the realities of modern space exploration, including SpaceX's dominance in orbit, the physics of zero-gravity physiology, the threat of orbital debris (the Kessler Effect), and the geopolitical implications of the Outer Space Treaty and the Artemis Accords.
• The episode deconstructs human psychology and history through a scientific lens, contrasting ancient evolutionary survival mechanisms, biblical lifespans, and UFO abduction narratives against modern medicine, social media outrage engines, and empirical evidence.

Key Concepts

• Disclosed Business Ties, Projects, and Show Sponsors: Neil deGrasse Tyson is the host of the StarTalk podcast, co-author and co-producer of Lost in Space: 5,000 Facts for Navigating the Universe (co-authored with Lindsey Nyx Walker as the fourth collaboration between StarTalk and National Geographic Books), and author of Take Me to Your Leader: Perspectives on Your First Alien Encounter (published May/earlier this year). Tyson also disclosed that he previously declined an offer from Pepsi to ride on the "Vomit Comet" (zero-gravity plane) in exchange for wearing a Pepsi jumpsuit to advertise zero-calorie Pepsi. Show sponsors disclosed by Theo Von include: PrizePicks (sports picks app; promo code TPW to play $5 and get $150 in bonus lineups if you win); Mountain Dew (beverage sponsor); Chime (fintech/banking app with services provided by Chime's bank partners at chime.com/theo, offering 5% cash back on the Chime Card in a chosen category and no overdraft, monthly, or minimum balance fees); Manscaped (Lawn Mower Ultra Gen 6; promo code THEO for 15% off and free shipping at manscaped.com or available at Best Buy); and BlueChew (BlueChew Gold chewable sexual performance tablets; promo code THEO at bluechew.com to buy 2 months and get the 3rd free, plus 10% off and free overnight shipping on the first order). Celsius cans are also visible on the table and referenced jokingly by Theo, though no formal ad read is performed.
• Cosmic Scale, Hierarchy, and Composition: The Sun is 864,000 miles wide—equivalent to 100 Earths lined up side-by-side, or a sesame seed bagel compared to Earth as a single sesame seed. Our cosmic hierarchy scales from the Earth, Sun, and planets (the Solar System), to 400 billion stars (the Milky Way Galaxy, which has a supermassive black hole at its center 30,000 light-years away, where humans have sent 0 people while only visiting the Moon 6 times), to thousands of galaxies (the Virgo Supercluster), and finally to combined superclusters (the Universe). It was only in 1925–1926 that Edwin Hubble discovered other galaxies exist outside the Milky Way. Regarding what happened before the Big Bang, Tyson hedges that equations over the last couple of decades suggest "maybe there's not just a universe, maybe there's a multiverse." Despite this vastness, 98% of all atoms in the universe are just hydrogen and helium; everything else we care about (iron, oxygen, silicon, nitrogen, phosphorus, carbon, etc.) is contained within the remaining 2%.
• Brain Complexity and Evolutionary Leftovers: According to Tyson's book Lost in Space, the human brain has 100 times more synaptic connections than there are stars in the Milky Way. Our brains remain wired for ancient tribal survival, which explains several counterintuitive behaviors: curiosity was often an evolutionary liability (the curious child investigating a rustling bush was eaten by a lion, while the fearful child survived to reproduce), and smelling someone else's vomit triggers sympathetic vomiting to purge shared food toxins across a tribe. While modern faucets and grocery stores have made caveman survival urges (like fearing outsiders at a watering hole or revering an "alpha" elk hunter) obsolete, social media algorithms, advertisers, and politicians exploit these leftover biological urges via "outrage engines" and celebrity worship. (

Quotes

• At 0:03:16 - "Take 100 Earths and line them up. That's the width of the Sun. Or, if you're hungry, I can say if the Sun were a sesame seed bagel, Earth would be the size of one of the sesame seeds." - Tyson using an everyday culinary analogy to make the 864,000-mile width of the Sun comprehensible.
• At 0:05:08 - "The universe inside your head is surely more complex than the universe itself. Which brings the question: how is it possible that the universe can make something more complex than itself?" - Tyson reflecting on the fact that the human brain has 100 times more synaptic connections than there are stars in the Milky Way.
• At 0:09:42 - "Curiosity is not always a good thing for your survival, if you're curious about things that could kill you." - Tyson explaining how evolutionary selection favored fearful early humans over curious ones who investigated predators.
• At 0:13:00 - "Evolution is about not only your survival, but the death of everything else that did not fulfill that moment for its survival." - Tyson clarifying the harsh reality of natural selection and why primal survival traits remain deeply embedded in our biology.
• At 0:15:04 - "The urge is still there even though society has made it irrelevant. It's biologically there." - Tyson explaining why humans still react to ancient tribal triggers (like alpha figures and resource hoarding) despite modern abundance.
• At 0:18:58 - "Social media is an outrage engine. You go anywhere on there, 'Hey, what are they doing? I hate that!' And it just, it feeds it. And then you come back for more, and advertisers love it." - Tyson describing how modern algorithms monetize our primal tribal warfare instincts.
• At 0:21:03 - "If an alien came down and they had technology that got them here, one of my first questions would be: how did you survive yourselves?" - Tyson discussing what a technological civilization must overcome to achieve interstellar travel without self-destructing.
• At 0:22:02 - "I think the evil alien concept is our own fears placed upon them in our storytelling. It's a mirror to how we know we would behave in that situation." - Tyson explaining why human fiction portrays extraterrestrials as hostile conquerors.
• At 0:32:58 - "Take Earth and shrink it down to a schoolroom globe. You can ask, how high up did they go? ... The space station is less than a half an inch above the surface. And then the Bezos, Branson trip, they're the thickness of two dimes above Earth's surface." - Tyson putting low-Earth orbit and billionaire suborbital space tourism into physical perspective.
• At 0:40:02 - "In space, in zero-G, body contact sends someone careening off the wall." - Tyson applying Newton's third law of motion to the physical mechanics of attempting unstrapped sex in zero gravity.
• At 0:43:52 - "An educator, a communicator, turns around, looks at their audience, and wonders: how is your brain wired for thought, for learning? And I'm going to shape my information to reach in there so I can access everybody in the room." - Tyson sharing his core philosophy on effective science communication and teaching.
• At 0:45:16 - "The molecule that gives you the flavor of mint twists—it's the exact same molecule, except in space it twists the opposite way from the molecule that gives you the flavor of caraway." - Tyson illustrating chiral chemistry and how 3D molecular geometry alters human taste perception.
• At 0:50:13 - "Fast forward to 1840, 1850: half of everyone born in the world was dead before they were 35. That's 10, 20,000 years. And you know, everyone over that time drank clear water, breathed pure air, they ate organic." - Tyson debunking the romanticized notion that an "all-natural, organic" environment guarantees health and longevity.
• At 0:51:36 - "There's three things: vaccines, antibiotics, and sanitation. Those three things doubled our life expectancy within decades." - Tyson identifying the exact scientific and medical interventions that rescued humanity from a 35-year average life expectancy.
• At 1:11:54 - "The good thing about science is it's true whether or not you believe in it." - Tyson emphasizing the objective reality of physical laws like Einstein's relativity and time dilation.
• At 1:18:46 - "The Kessler effect is there's a threshold above which, if a single satellite gets destroyed, there are enough other satellites ready to be destroyed by its debris that it systematically destroys 100% of the satellites in orbit." - Tyson warning about the cascading danger of orbital space debris traveling at 18,000 mph.
• At 1:21:42 - "If you can go into space with all these countries and be peaceful and kind to one another, then go ahead and do that on Earth! What do you mean you can't do that on Earth, but a treaty is going to make us do that in space?" - Tyson questioning the irony of the 1967 Outer Space Treaty mandating peace in space among nations that wage war on Earth.
• At 1:39:32 - "Bananas have 25% identical genes to human beings. And because of that, if you get an alien from another planet that has no DNA at all, or has DNA but none of it is in common with us, it should look at least as different from humans as bananas and humans look from each other." - Tyson using genetics to critique the lack of imagination in Hollywood depictions of humanoid aliens.
• At 2:09:44 - "Reasonable people follow rules and do what they're told. Unreasonable people break rules and do things that they're not supposed to do. So all advances in civilization have come about from the work of unreasonable people." - Tyson explaining why human progress depends on challenging established norms and conventions.
• At 2:10:47 - "Do you realize that 98% of all atoms in the universe are hydrogen and helium? 98%. Everything that is what we care about and love is enabled by what's in that 2%." - Tyson highlighting how all complex chemistry and life are built from a tiny fraction of cosmic trace elements.

Takeaways

• Audit your emotional reactions to social media and advertising: Recognize when "outrage engines," politicians, and marketers are artificially hijacking your obsolete caveman instincts (such as tribal fear of outsiders, sex drives, or reverence for "alpha" figures) so you can reclaim your mental autonomy.
• Tailor your communication to the listener's mental wiring: When teaching or explaining complex ideas, don't just recite facts; look at how your audience's brains are wired and use relatable analogies (like a sesame seed bagel or a schoolroom globe) to meet them where they are.
• Evaluate "all-natural" health claims with historical context: Avoid falling for the fallacy that "organic" or "chemical-free" automatically means healthier by remembering that 30,000 years of pure air, clear water, and organic food yielded a 35-year life expectancy until vaccines, antibiotics, and sanitation doubled and tripled human lifespans.
• Scrutinize the cultural geography of extraordinary claims: When evaluating phenomena like UFO sightings or alien abductions, look at global distribution data (such as the MUFON map showing sightings concentrated heavily in English-speaking nations) to distinguish cultural contagion from universal scientific evidence.
• Check if human projections are coloring your hypotheses: Whether imagining extraterrestrial life or predicting how other groups will behave, ask yourself if you are merely projecting human DNA (expecting bipedal humanoids) or human historical aggression onto an unknown subject.
• Protect scientific literacy to prevent manipulation: As illustrated by Christopher Columbus using lunar eclipse tables to extort food from indigenous locals, a gap in scientific understanding allows those with knowledge to exploit those without it.
• Support proactive orbital debris management: With active satellites passing 18,000 and un-cataloged millimeter-to-centimeter debris numbering in the hundreds of millions, advocate for international regulatory standards that prevent the Kessler Effect from wiping out global satellite infrastructure.
• Look beyond surface formulas to 3D structure and biological compatibility: As demonstrated by chiral molecules (mint vs. caraway) and indigestible synthetic fats (Olestra), remember that how a substance interacts with human biology depends on its physical configuration and enzymatic compatibility, not just its chemical ingredients.
• Cultivate safe spaces for "unreasonable" thinking: Because curiosity can be penalized in rigid environments and "reasonable" people simply follow existing rules, deliberately encourage rule-breaking, unconventional inquiry to drive genuine innovation and civilizational progress.
• Demand Earth-bound accountability from international agreements: When nations sign high-minded agreements like the Outer Space Treaty or the Artemis Accords promising peaceful cooperation in the cosmos, challenge leaders to apply those exact same cooperative frameworks to terrestrial conflicts.
• Test sociological hypotheses with rigorous research rather than intuition: When encountering compelling theories—such as Theo's hypothesis that neurodivergent tech creators inadvertently build socially isolating platforms—treat them as hypotheses worth testing rather than settled conclusions until empirical data is gathered.
• Use the "Cosmic Perspective" to cultivate gratitude and humility: Remind yourself that everything we love and care about is constructed from just 2% of the universe's trace atoms on a tiny "sesame seed" planet, using that perspective to deflate petty tribal divisions.