Why does our civilization send signals and our location into space?
Individually doing atmospheric analysis for every planet in the galaxy is probably an impossible task for a civilisation confined to a single solar system. Listening for signals is something our civilisation already does. If we discover radio signals from a primitive civilisation in the next star system over there's a non-zero chance we'd panic and try to wipe them out.
That's the risk that dark forest theory is talking about. Maybe the threat comes from a civilisation dedicated to wiping out intelligent life that just hasn't found you yet, maybe it just comes from your nearest neighbor. Maybe there's no threat at all. The risk of interplanetary war is still too great to turn on a light in the forest and risk a bullet from the dark.
And while knowing this, why do we still not choose to just observe and be as quiet/ non existant as possible?
Everything that travels via a wave (wifi, gsm, radio, tv, etc) travels in more or less planar dimension. in order to stop it, you'd have to have some kind of wave blocking shutter (physical requirements for such a block would depend on the length of the waves you want to block) around the whole planet. Blocking waves is not feasible as long as we want to have sun
The dangers of Active SETI are based on a lot of human-centric assumptions.
Any hypothetical alien civilisation advanced enough to pose a threat may see our radio broadcasts and space probes as being so crude that they consider us too harmless to bother with.
If there are actively “xenocidal” aliens out there they may also have far more effective ways of detecting their targets.
Disagree. The counterargument is simple - space is large and time is long. We aren't a threat now but we could easily become a threat in, say, 1000 years. Which, is basically no time at all in interstellar politics. Any species who could potentially become a technical capable threat should be assumed as a technically capable threat.
The Dark Forest theory is something that makes for a scary sci-fi novel, but it isn't really plausible in the real world. One of the major reasons is that individually doing atmospheric analysis for every planet in the galaxy actually is an entirely possible task, especially for a civilization that's supposedly advanced enough and close-by enough to be able to destroy our civilization somehow. If advanced alien civilizations were present in our galaxy and had the philosophy of destroying potential competitors before they also become advanced then we should have been wiped out hundreds of millions of years ago already. We shouldn't exist under a Dark Forest scenario.
In Alastair Reynolds' Revelation Space series, the victors of a "dawn war" far in the galaxy's past were machines and they decided to wipe out any sentient life in the galaxy for reasons that aren't important here, but not life in general. But by the time we came around they had degraded to the point that they weren't doing a good job anymore and a few civilizations were just starting to slip out into space. Then they get detected and destroyed.
So the combination of wanting to destroy civilizations, but not all life and breaking down over time would allow it.
This is another example of a scary sci-fi novel needing a very specific set of circumstances to arise in order for the scary sci-fi novel's story to work. It isn't a plausible case to be basing any real-world decisions or science on.
It's like trying to have a serious discussion of vigilantism and the death penalty and someone brings up Freddy Krueger as the basis for their argument.
Here is my take on it. It all depends on if there is some sort of hard limit on how much we can accelerate an object with mass in space.
If we are capped at say, 25% of the speed of light we will most likely never meet our intragalactic neighbours. The times scales and distances involved are insurmountable and economically they would have no reason to attempt travel to another inhabited planet. The journey is too dangerous on many levels to be worth attempting. No reason to contact, no reason to fight, many closer resouces in our respective solar neighbourhoods that wont shoot missiles at us.
If we live in a universe that allows for FLT or even just 99.9999 percent of c then the alien overlords are already aware of us and are chill enough to leaves us be for the most part. So it really almost doesnt matter in my opinion.
I did love the 3 body problem trilogy, Liu Cixin is a master story teller.
Unless they have been actively and vigorously scouting for us with FTL travel, our earliest radio transmissions, even if we assume they're somehow still recognizable and not totally lost in the background noise of space, have only made it about 126 light years or so from earth (and honestly our very earliest ones probably wouldn't be recognizable from very far at all, Marconi's radio was of course pretty crude, it was our first time playing with radios, so we can probably chop a good 20+ light-years off of that easily if we're being realistic)
Now that encompasses some 60,000 or so stars, which is a tiny speck of the observable universe, and depending on how you fill out the Drake equation that could be a whole lot of aliens out there listening, or literally no one. And only about half of them, assuming no FTL travel or communication, would have had a chance to get a response to us by now (if they even wanted to) since their response would have to travel at or below C.
If they're in the Milky Way or nearby intergalactic space and have bothered to point instruments at us that are far beyond the capabilities we have on earth now today within the last 300,000 years, they may know that homo sapiens exist, but they'd need to be within 3000 light years to know that we entered the bronze age, and within about 200 to know that we've even started playing with electricity (and counting on them looking specifically at us is a real long-shot)
Parts of the Andromeda galaxy, at best, is maybe aware that Australopithecus evolved. Any further out and no one has any clue that anything really resembling humans at all is here.
Now that sort of isolation does give us a bit of security in case there is a xenocidal race that would like to wipe us out somewhere in the universe, unless we're very unlucky we probably have a long time before we have to worry about them even knowing we're here, and at least that long again until they can do anything about it (unless they do have FTL travel) so probably not something we actually need to be concerned about, again unless we get really unlucky the sun dying in a couple billion years is probably a more pressing concern.
I think it's likely we're the first and oldest advanced civilization in the universe, which means we'll likely always have a technological advantage to the tune of 100+ thousand years head start. It's entirely plausible that we are the future's xenocidal species.
Our nearest intragalactic neighbors are no closer than 4.25 ly. We’re not going to get out of our solar system with a manned mission. You can forget about intergalactic.
Long story short, hiding in a universe with even slow interstellar travel is not a viable long term survival strategy. You're vastly underestimating the potential industrial capacity of even a single solar system.
Not to mention the signal degrades, and the signals from the ww2 era have only reached 80 light years away. Any farther away and the signal has not reached them yet
I agree with you here. If we just listen we can know that they are the ones who want to make contact, not us. The we can make the decision whether to send a message back or not.