The Diary of a CEO with Steven Bartlett

Guest: Neil deGrasse Tyson
Episode: "The Brutal Truth About Astrology! Our Breath Contains Molecules Jesus Inhaled!"
Date: October 13, 2025

Overview

In this captivating episode, Steven Bartlett interviews renowned astrophysicist Neil deGrasse Tyson about the nature of belief, the cosmic perspective, the boundaries between science and spirituality, the popularity of astrology, the possibility of life elsewhere, the meaning of life and death, and the role of scientific literacy in a divided world. With his signature blend of wit and depth, Tyson navigates both the profound and pragmatic, challenging commonly held notions about fate, knowledge, and the human experience while offering a celebration of curiosity and humility.

Key Discussion Points & Insights

1. The Rise of Astrology and Critical Thinking

[00:00 – 01:35]

• Steven opens by noting that 80% of Gen Z believe in astrology and act on it.
• Tyson expresses concern: “But what would be sad is if that number got to 100%, then the civilization just goes back to the cave...” (00:05).
• Tyson stresses making meaning through agency, not through planetary positions.

2. Cosmic Perspective: Unity and Stardust

[00:56 – 06:25]

• Tyson takes a “cosmic perspective,” noting humans' tendency toward tribalism and conflict over arbitrary divisions, and counters this with the reminder that we share the same atomic origins:
  • “You have 20% identical genes to a banana.” (01:11)
  • All life is connected, both genetically and materially: “There are molecules that went in and out of your lungs that are in China being breathed by people there...Jesus inhaled them.” (01:18, 72:33)
  • “It’s not just that we are alive in the universe. The universe is alive within us.” (10:09–10:54)
• Steven expresses how this perspective lessens worries, making him feel “meaningless in a happy way.” (05:51)

3. Mortality and Meaning

[02:49 – 06:25]

• Tyson reflects on losing his parents and the finitude of life:
  • Purpose and resolve are sharpened by the awareness of mortality. (02:49–04:20)
  • “If you lived forever...you’d lead a life of no meaning at all...” (04:01)
  • He aspires to “be ashamed to die until you have won some victory for humanity.” (04:40)

4. Science, Religion, and the Evolution of Belief

[15:48 – 25:00]

• Tyson discusses his secular upbringing and gradual skepticism: “By the time I was nine...the universe discovered me” at the planetarium. (16:01)
• He intentionally acquired and read sacred texts to have meaningful conversations, not to dismiss others’ faith.
• The roots of religious ritual go back to early humans, with groupthink and tradition offering both survival value and division:
  • “Religion’s greatest value may have been the community it created.” (28:32)
  • “Ritual is one of the strongest binding forces of society that we have.” (24:54)
• Tyson’s approach: Learn enough to meaningfully discuss beliefs, but focus on evidence and curiosity.

5. Simulated Universes and Free Will

[35:27 – 40:48]

• Tyson entertains the simulation hypothesis:
  • “It’s simulated universes all the way down...” (35:34)
  • Ultimately, even if we are simulated, so what? Live well regardless.
• On free will: “If you don’t have free will, then you don’t even have an option to say you don’t. So you just live life...” (40:30)

6. On AI, Creativity, and Human Adaptation

[49:01 – 52:55]

• Tyson is enthusiastic about AI’s contributions to science but notes that true creativity requires moving beyond imitation.
• Warns that superintelligence could relegate humanity to the status of pets:
  • “Superintelligence...becomes our overlord and we become its pet. But don’t we treat our pets better than we treat other humans?” (52:02)

7. Space Exploration: Science, Geopolitics, and Mars

[53:27 – 62:40]

• Tyson asserts there’s zero chance for Steven to go to another planet in his lifetime, pointing out the historical/geopolitical motives behind major space endeavors:
  • “We only do big expensive things if there’s a geopolitical reason...not just because it’s the next thing to do.” (53:46)
• Notes Artemis and China’s lunar ambitions have reignited interest in the Moon, not Mars, and that no economic case exists for Mars colonization.

8. Black Holes, Stardust, and Cosmic Mysteries

[64:13 – 75:26]

• Black holes explained as the ultimate escape from gravity—a “three-dimensional hole.”
• A golf-ball-sized black hole would weigh more than Earth:
  • “When black holes eat, they get bigger... a lime is bigger than a golf ball, but not by very much.” (68:31)
• Universe’s size and boundary are considered: “We’re not given reason to think it doesn’t [go forever]...it’s simpler mathematically to think it goes forever.” (75:26)
• Breath and water cycle interconnection: “With every breath, you inhale molecules that went through everyone, even Jesus.” (72:33)

9. Aliens: The Probabilities and Evidence

[76:33 – 83:52]

• Skeptical of UFOs as evidence of alien visitation: “If you see something...you don’t know what it is, it’s a UFO, not an alien.” (76:58)
• Strongly argues, statistically, that extraterrestrial life surely exists, given “the most common ingredients in the universe are the ingredients of life on Earth.” (79:43)
• Probability of 100 civilizations currently alive in the Milky Way: "I did it with two colleagues...about 100 civilizations in the galaxy alive now." (82:54)

10. Uplifting Wisdom: Making Meaning and Facing Death

[40:50 – 48:40; 106:54 –124:09]

• Tyson on meaning: “I stopped looking for meaning decades ago...Any of us has the power to make meaning in life.” (40:50)
• On death: “I don’t want to live forever...If you live forever, there are other people you’re taking resources from.” (45:59)
• Advice to younger self and listeners: Learn from mistakes and stay open; “At no time should you overvalue your own thoughts...be humbled daily with new ideas that challenge any or everything that you currently think. That’s wisdom.” (123:34)

Notable Quotes & Memorable Moments

• “People value what they think is true more than what is true. That’s a recipe for the unraveling of civilization.” — Neil deGrasse Tyson (01:24)
• “There are more molecules in a breath of air than there are breaths of air in Earth’s atmosphere...Jesus inhaled them.” — Tyson (72:33)
• “It’s not that we are alive in the universe. The universe is alive within us.” — Tyson (10:09)
• “If you don’t have free will, then you don’t even have an option to say you don’t. So you just live life; just live your life so that the world is better off for you having lived in it.” — Tyson (40:30)
• “If to you God is where science has yet to tread, then God is an ever-receding pocket of scientific ignorance.” — Tyson (104:24)
• “Don’t overvalue your own thoughts. Allow yourself to be humbled daily.” — Tyson (123:34)
• “I've seen people burning rock and roll records...I don't want to be that guy. I'd rather be the person that says they're going to create a whole other reality...” — Tyson (25:40)
• “If meaning was the same for everyone, you’d just publish it, everyone reads it, and then we all have meaning. No, you gotta make it yourself.” — Tyson (93:39)

Timestamps for Major Segments

| Segment | Description | Start | |-------------------------------------------|-----------------------------------------------------------|-----------| | The Astrology Divide | Astrology, Gen Z, determinism, agency | 00:00 | | Cosmic Perspective, Suffering, Stardust | Interconnectedness, cosmic humility, oneness | 01:56 | | Mortality and Making a Difference | Meaning, death, urgency, purpose | 02:49 | | Science, Religion & Groupthink | Upbringing, reading the texts, social binding | 15:48 | | Simulation Theory, Free Will | Are we simulated? Practical philosophy | 35:27 | | AI, Superintelligence & Creativity | The promise, limits, and risks of AI | 49:01 | | Space Exploration & Mars | Geopolitical drivers, historical perspective | 53:27 | | Black Holes, Elements, and Infinity | Explaining cosmic phenomena | 64:13 | | Aliens: Evidence & Probability | Skepticism, cosmic likelihood of ET life | 76:33 | | Advice, Regret, and Wisdom | Advice to young self, humility, learning | 106:54 | | Final Reflections | Perspective on America, education, and societal unity | 111:27 |

Flow & Tone

• Warm, deeply curious, and occasionally humorous (e.g., his “banana DNA” references, simulation programmer as a snot-nosed alien kid).
• Tyson combines scientific literacy with cosmic awe—encouraging listeners to seek evidence but also to marvel at our existence.
• The conversation is consistently thoughtful; there is no condescension toward believers, but Tyson holds strong on the pivotal value of objective truth and humble curiosity.

Episode Takeaways

• Oneness: We are fundamentally connected at the atomic and biological level to each other, to plants, and to the universe.
• Skepticism is Key: Accepting what we wish to be true over what’s objectively true is dangerous for civilization.
• Meaning Is Created, Not Discovered: Meaning and purpose are active pursuits, not pre-set treasures to be found.
• Scientific Literacy Matters: Without it, societies are at risk of tribalism, division, and stagnation.
• Question Everything—but Embrace the Unknown: The greatest advances come not from having answers but from loving the process of questioning.

For Listeners Who Missed It

If you haven’t listened, this episode offers an intellectual adventure across science, philosophy, meaning, mortality, and hope—anchored by Neil deGrasse Tyson’s call for wonder, skepticism, and kindness, all suffused with the humility of the cosmic perspective.