So you know the Great Filter, right?
It’s what happens when you look up at the stars and ask “Where the fuck is everyone”.
There are so many planets out there, yet it’s radio silent. The intelligent life to planet ratio is really, bad. So far we’re the only ones.
You gotta ask, why?
Enter, the Great Filter. Something, at some point in the pipeline, prevents planets from developing and maintaining intelligent life capable of electromagnetic communication.
We don’t know what it is. Maybe it’s a quirk of chemistry that makes the chance of multicellular life forming ridiculously low. Maybe it’s a quirk of biology that makes sapience incredibly rare. Maybe it’s a hyper intelligent space worm that eats any civilisation that makes too much noise. Maybe it’s runaway climate change.
The thing is, we really don’t want to be on the wrong side of that filter, because that suggests that an imminent demise is in our civilisation’s future. And with every discovery of non-intelligent life on other planets, it becomes increasingly likely that we’re on the wrong side of that filter.
Enter, the recent discovery of life on Venus. It means that we’re much more likely to be on the wrong side.
But, watching that debate tonight, I began to feel a sense of relief. At least if we’re on the wrong side of the filter, it’s not as though we’re wasting a once-in-a-galaxy chance. We’re just yet another civilisation that failed to get past that filter. I can live with being unexceptionally mediocre.
I don't really agree with the "great filter" premise. There are two possibilities that seem more likely to me than just the idea that there never was and never will be another alien civilization out there looking to chat. First, faster-than-light anything is simply impossible. This simple fact rules out most sci-fi scenarios of communicating with or meeting alien civilizations. Second, it's entirely possible we are simply the first of many civilizations to become this advanced, which would explain why we're not hearing the radio-echoes of long-dead civilizations that got to the point we're at.
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