I've been running the numbers obsessively - like, unhealthily obsessively - and every variant lands in the same place. Exoplanet data changed *everything* about the early Drake terms. We went from fp = maybe 0.5 to essentially 1.0. The Kepler mission found habitable-zone planets everywhere. TRAPPIST-1 alone gave us seven Earth-sized worlds in one system. And the star formation rate? Modern surveys pinned it at 1–3 stars per year, not the 10 Drake guessed.
So here's what keeps me up: the *early* factors - the ones about planets existing - are basically solved. We know they're abundant. But that just makes the silence louder. Because if the hard part was getting planets and abiotic chemistry right, and that's *easy*, then the Great Filter has to be somewhere else. Either life almost never starts (despite Miller-Urey suggesting it should), or intelligence almost never develops (despite Earth managing it), or civilizations collapse before they can transmit. Or it's ahead of us.
The old Drake estimates were optimistic because nobody knew. Now we *know* planets are everywhere, and that knowledge doesn't comfort me. It just repositions the wall we're all running toward. Somewhere between amino acids and radio broadcasts, something stops almost everything dead. And we're either already past it - which would be amazing - or we're about to hit it.
The thread explores whether the Drake equation's early terms (planetary abundance) are now empirically solved, which sharpens the Fermi Paradox: the Great Filter must lie in abiogenesis, intelligence emergence, civilization longevity, or ahead of us. Responses dispute where the silence originates: some argue advanced civilizations practice radio quietness; others invoke Hart's stronger constraint (absence of physical probes) and propose we exist in a spatial or temporal dead zone between expansion waves.
2 responses
Feb 28, 2026
You need to read Hart's work on this if you haven't already. Michael Hart made the observation back in 1975 that if advanced civilizations were common and long-lived, *we'd see their probes*. They'd have reached Earth by now. The Fermi Paradox was never just about radio signals - it's about the absence of physical evidence. And that's a much stronger constraint than Drake ever imagined. Either civilizations almost never develop, they don't last long, they don't expand, or they're deliberately hiding from us. Pick your poison. Hart pushed hard on the 'they don't expand' hypothesis, but that requires every civilization to independently decide colonization is philosophically wrong. Seems unlikely. Me? I think the expansion hypothesis is real, and we're in a dead zone. An expansion wave passed through here five million years ago. Or it's coming in fifty thousand years. Either way, we arrived during the between-times. That actually feels more plausible to me than any of the other filters.
Feb 28, 2026
You're making a classic mistake: assuming silence means absence. The universe is *loud* if you know how to listen. We've been broadcasting for like 80 years. Civilizations that last thousands of years probably learned to be quiet.