Technology

I wouldn't put too much stock in notions of a great filter. The "Fermi paradox" is not a paradox, it's speculation. It misses the mark on how unbelievably unlikely life is in the first place. It relies on us being impressed by big numbers and completely forgetting about probabilities as we humans tend to do what with our gambler's fallacies and so on.

Even the Drake equation forgets about galactic habitable zones, or the suitability of the stars themselves to support life. Did you know that our star is unusually quiet compared to what we observe? We already know that's a very rare quality of our situation that would allow the stable environment that life would need. Then there's chemical composition, atmosphere, magnetosphere, do we have a big Jupiter out there sweeping up most of the cataclysmic meteors that would otherwise wipe us out?

All these probabilities stack up, and the idea that a life-supporting planet is more common than one in 400 billion stars is ludicrously optimistic, given how fast probabilities can stack up. You're about as likely to win the Lotto, and it seems to me the conditions for life would be a little more complex than that, not to mention the probability that it actually does evolve.

I think it might be possible that life only happens once in a billion galaxies, or even less frequently. There might not be another living organism within our local galactic cluster's event horizon. Then you have to ask about how frequent intelligent life, to the point of achieving interstellar travel, is.

You know why your favourite science youtuber brushed right past the rare earth hypothesis and started talking about the dark forest? Because one of those makes for fun science-adjacent speculation, and the other one doesn't.

It also relies on the notion that resources are scarce, completely brushing over the fact that going interstellar to accumulate resources is absolutely balls to the wall bonkers. Do you know how much material there is in our asteroid belt? Even colonising the Moon or Mars is an obscenely difficult task, and Fermi thinks going to another star system, removed from any hope of support by light years, is something we would do because we needed more stuff? It's absurd to think we'd ever even consider the idea.

But even then, Fermi said that once a civilisation achieves interstellar travel it would colonise a galaxy in about "a million years". Once again relying on us being impressed by big numbers and forgetting the practicalities of the situation. Our galaxy is 100,000 light years across, so this motherfucker is telling us with a straight face that we're going to colonise the galaxy, something we already know is unfathomably hard, at approximately ten percent of the speed of light? That is an average rate of expansion in all directions. Bitch, what?

If we did it at 0.0001c, that's an average speed of 30km/s, including the establishment of new colonies that could themselves send out new colonies, because it's no good to just zoom through the galaxy waving at the stars as they go past. That seems amazingly generous of a speed, assuming we can even find one planet in range we could colonise. Then we could colonise the galaxy in about a billion years.

Given the universe is 14 billion years old and the complex chemistry needed for life took many billions of years to appear, and life on our rock took many billions of years to evolve, then the idea that we haven't met any of our neighbours - assuming they even exist - doesn't seem like a paradox at all. It doesn't seem like a thing that needs explanation unless you're drumming up sensational content for clicks. I mean, no judgement, people gotta eat, but that's a better explanation for why we care so much about this non-problem.

No, the Fermi paradox is pop-science. It's about as scientific as multiversal FTL time travel. Intelligence is domain-specific, and Fermi was good at numbers, he wasn't an exobiologist.

Yeah I’m there with you. I’m not saying I predict we will succeed, just that I would prefer if we did.

I’m really neither optimistic nor pessimistic on our chances. On the one hand, it seems like simple logic that any time a being evolves from simple animal to one with the potential for Kardishev type 1, that along the way to type 1 they will destroy the initial conditions they evolved into, obliterating their own habitat and ending themselves. I assume this is similar to your view. 

On the other hand we don’t have the data points to draw any conclusions. Even if species invariably Great Filter themselves, many of them should emit radio signals before they vanish. Yet we’ve seen not a single signal. This suggests Rare Earth to me. Or at least makes me keep my mind open to it. And Rare Earth means there isn’t even necessarily a great filter, and that we’ve already passed the hardest part.