David Sterling: Megan, I have to ask — you sent me that Kahane paper at eleven-thirty at night. What were you doing?
Megan Skiendel: Honestly, I couldn't let it go. I'd been re-reading Tyson — the Cosmic Perspective thesis, the stardust argument — and something kept snagging. The claim that situating yourself inside 13.8 billion years of Hot Big Bang expansion is foundational to setting human priorities, not just poetic. That's a strong claim. And then I hit Kahane's 'Our Cosmic Insignificance' and I thought, wait — he's working from the exact same hundreds-of-billions-of-galaxies fact set, stellar nucleosynthesis, the whole framework, and concluding that human life may be objectively unimportant.
David Sterling: So Tyson uses the scale to argue you matter more. Kahane uses it to argue you matter less.
Megan Skiendel: And neither one is misrepresenting the physics. That's what gets me.
David Sterling: Then the real question — the one that actually matters here — is what the facts are licensing. Because if the same data set produces opposite ethical conclusions, the data isn't doing the work. Something upstream of the data is.
Megan Skiendel: The person deciding which direction to point them. Tyson has the Hayden Planetarium, the institutional platform, the bestsellers. He needs the cosmic perspective to feel empowering — structurally needs it — or his entire project collapses into nihilism. Kahane has none of those constraints. So they walk out of the same universe with completely different lessons.
David Sterling: That's the episode, then. What exactly are the cosmic facts doing?
Megan Skiendel: Think about a photograph. Carl Sagan's Pale Blue Dot — Voyager 1, 1990, Earth from 3.7 billion miles out. The image is just light hitting a sensor. Sagan called it 'a mote of dust suspended in a sunbeam.' Some people looked at that and felt this fierce tenderness toward the planet. Others looked at the exact same frame and felt — what's the point. Same photograph. No instruction manual.
David Sterling: The physics is neutral. The frame is not.
Megan Skiendel: Exactly — and that's the move nobody names. Edwin Hubble proves there are billions of galaxies, blows up anthropocentric cosmology entirely in the early twentieth century. Devastating fact. But it arrives with zero ethical instruction. Tyson picks it up and says: connection. Kahane picks it up and says: insignificance. The Cosmic Microwave Background, the thermal echo from 380,000 years post-Big Bang — same thing. Tyson says it's the origin story of everything you are. Luke Elson says that same scale is actually evidence against moral realism. Against the idea that ethics is real at all.
David Sterling: Wait — Elson's using the CMB to argue ethics might not exist?
Megan Skiendel: Not the CMB specifically, but the scale it represents — yeah. Inference to Best Explanation. The universe is vast, mostly empty, indifferent. That vastness, he argues, is harder to square with a cosmos that contains objective moral facts than with one that doesn't.
David Sterling: I mean — that's actually the sharper version of the problem, isn't it. Because Tyson and Kahane disagree about what cosmic scale means for how you feel. Elson is saying it damages the ground beneath the argument entirely. You can't even get to 'should' from here.
Megan Skiendel: And Tyson's whole project requires 'should.' Requires it. If the stardust argument is just — you're made of stellar nucleosynthesis, therefore feel connected — that's a mood, not a conclusion.
David Sterling: So the question is: who decided Sagan's reading was the authoritative one? He stood at a podium in 1990 and pointed the image toward humility, fragility. That framing won. Culturally, it won. But it didn't have to.
Megan Skiendel: It won because Sagan had the room. That's the whole story. The physics hands you a Rorschach made of galaxies, and the person with the microphone decides what you see.
David Sterling: But that's where I want to push — because 'person with the microphone decides' explains the cultural outcome. It doesn't explain why the framing is wrong. And Izhar Cohen's Alvy's Error is making a different claim — it's not about who wins the room. It's that importing cosmic timescales into human decisions is a category mistake. Full stop.
Megan Skiendel: Right — and the name matters. Cohen pulls it from Annie Hall, 1977. The kid who won't do his homework because the universe is expanding. That's Alvy's Error. The mistake isn't pessimism — it's applying the wrong level of analysis entirely.
David Sterling: So what's the right level?
Megan Skiendel: Human timescales. Forty to a hundred years. Here's the concrete version — a hospital administrator, nine o'clock tonight, two funding proposals on her desk. Pediatric ward expansion versus a long-term climate resilience program. She has to choose. Now tell me — knowing that stellar nucleosynthesis forged her atoms five billion years ago, inside a star that exploded, that adds what, exactly, to that calculus?
David Sterling: It adds nothing. The causal consequences of her decision are bounded by human-scale systems — a pediatric ward serves kids born in the next decade, a climate program has a fifty-year horizon. Neither of those connects to 13.8 billion years without — I mean, you'd need additional argument just to get a foothold.
Megan Skiendel: Which nobody provides. And that's the gap. Cosmic Inflation — that exponential expansion a fraction of a second after the Big Bang — explains the flatness of space. Empirically supported. Zero decision-relevant information for the administrator at nine PM.
David Sterling: And Elson goes further than that, right? It's not just — cosmic scale is irrelevant to the choice. He's arguing via Inference to Best Explanation that the universe's emptiness actively counts against there being objective moral facts. So she's not just missing information. The framework she'd use to justify either choice is — what, undermined?
Megan Skiendel: That's the reversal. Tyson needs cosmic perspective to build toward meaning. Elson uses the exact same scale to erode the ground meaning stands on. A universe this vast and this indifferent is, by Inference to Best Explanation, harder to square with objective moral facts than with their absence. Robust moral realism becomes less likely the more seriously you take the emptiness.
David Sterling: And the part that makes this worse — whether Tyson's framing actually causes people to make different decisions, or just makes them feel different while making the same ones — that's what we have to get into next.
Megan Skiendel: And that silence — no documented case — is the whole problem with Tyson's project. Not the physics. The claim that standing in the Hayden Planetarium and absorbing the Cosmic Web, galaxies in filaments, vast voids between them, actually changes what you do on the way out.
David Sterling: What would that even look like? A specific person, a specific call they changed.
Megan Skiendel: I've looked. Honestly. Sagan's Pale Blue Dot — 1990, Voyager 1, the whole cultural moment — correlates with increased public engagement on existential-scale issues. Climate. Space funding. But correlates. Nobody has closed the loop and said the cosmic framing caused that shift rather than just — arrived alongside it.
David Sterling: That's the gap right there. Correlation isn't mechanism. And Kahane's analysis actually makes it worse — because he's showing the same perspective that Tyson uses to motivate action could just as logically produce paralysis. Identical input, incompatible outputs.
Megan Skiendel: Which means the behavioral direction isn't coming from the cosmic facts at all.
David Sterling: Right — but the part that doesn't fit is Tyson's institutional position. He's Director of the Hayden Planetarium. That role is built on the premise that exposure to cosmic scale verifiably shifts human priorities — around climate, existential risk, space funding. That's not incidental. That's the justification for the whole enterprise.
Megan Skiendel: And if the mechanism doesn't exist — I mean, if there's genuinely no causal chain between cosmic awareness and a changed decision — then what Tyson is actually running is a very expensive mood-induction program.
David Sterling: Frankly, that's Alvy's Error plus a budget line.
Megan Skiendel: And honestly, that's the inversion the whole thing leads to. We started with Tyson's premise — cosmic understanding is foundational to how you set priorities. But what the Hot Big Bang Model, the CMB, stellar nucleosynthesis, hundreds of billions of galaxies — what all of it actually shows is that the same empirical floor supports Tyson's enlarging and Kahane's crushing insignificance with equal fidelity. Which means the ethics came first. You walk in with a framework, and the universe hands it back to you amplified.
David Sterling: The question isn't what the universe teaches you about ethics. It's what your ethics tell you to do with the universe.
Megan Skiendel: Sagan looked at Voyager 1's photograph from 3.7 billion miles out and saw fragility worth protecting. Someone else looked at the same frame and felt nothing move. Same sensor. Same light. I mean — the physics didn't change between those two people. They did.
David Sterling: Which is where Tyson's project is — I won't say wrong, but it's backwards. Structurally backwards.
Megan Skiendel: Structurally backwards. That's a good place to stop.
