5 ms·
I just finished reading The Three Body Problem and I can't help thinking that we could send signals that would reach these planets in 40 years, we could get a r
by jcoffland 9y ago
I just finished reading The Three Body Problem and I can't help thinking that we could send signals that would reach these planets in 40 years, we could get a response in 80 and if we could achieve c/10 we could get there in something like 500 years depending on acceleration.
- throwaway91111 9y agoWouldn't it be better to wait until we have superliminal travel to run away if they don't like us? Or better yet, stay radio silent.
- wiz21c 9y agoIf they have the power to come to us, they certainly have the power to find us, silence or not.
- devrandomguy 9y agoI think we're a bit too late for radio silence. Even if our comms are indistinguishable from noise at that distance, I bet our previously detonated nukes would have sent distinctive pulses across the near cosmos. I wonder, does SETI look for signs of alien nuclear wars?
- DougWebb 9y agoSomeone else can figure out the math, but I'm pretty sure the energy from all of the nukes that have been detonated, especially if you only count the open-air ones, is minuscule compared to what the sun gives off. That would mask any possible detection. I wouldn't be surprised if just the solar radiation that the earth reflects is enough to mask the nuclear blasts, unless you're viewing them from right inside the solar system.
- kobeya 9y agoThe spectral signature would be quite different.
- therein 9y agoWhat kind of unique signs would a nuclear explosion create? Doesn't nuclear fission occur naturally?
- kobeya 9y agoNot really? Only in very rare exceptions. At least if you're talking about chain reaction fission.
- deleted 9y ago[deleted]
- CamperBob2 9y agoThose gamma-ray bursts have to be coming from somewhere, I guess.
- labster 9y agoGamma ray bursts are from interplanetary war? That's a terrifying thought.
- CamperBob2 9y agoMy pet conjecture has always been that they're the interstellar equivalent of "Hold my beer and watch this..."
- mirimir 9y agoIn Pellegrino and Zebrowski's The Killing Star, it's the know-it-all attitude in Star Trek that seals our fate.
- kobeya 9y agoIt is extremely unlikely that superluminal travel exists. It would fundamentally violate so many physical laws (including causality) that our prior for that should be low indeed.
- spookyuser 9y agoI also recently finished The Three Body Problem, we could get there in 500 years with the minor caveat that we are not killed in a dark forest strike sometime before then.
- bognition 9y agoThe dark forest strike is an interesting idea but there is no reason to actually believe that is how intelligent life on different planets would behave.
- spookyuser 9y agoTrue. It's not based on any hard evidence but IMO the author made a persuasive argument for it.
- p1esk 9y agoIt is extremely unlikely that even if there has ever been an intelligent life there, it's at a similar civilization development stage to ours, today. It took ~4B years to get where we are today on this planet, but the age of our civilization is only about a hundred thousand years. In a few thousand years our civilization will advance so much that it will be completely unrecognizable (or cease to exist), so you're asking for either an overlap in two extremely short historical windows, on planets developing independently for billions of years, or you expect their civilization to be stuck at about our level for many millions of years.
- justin_vanw 9y agoYes, so much this! This is why things like SETI (and arecibo for finding ETs) make no sense. I compare it to using a telescope in 1850 to look for https://en.wikipedia.org/wiki/Flag_semaphore https://en.wikipedia.org/wiki/Flag_semaphore in space. The technology we have to send signals today will look completely pathetic to us when we look back on them in 50 years. Why would we expect ETs to use technology that we ourselves will abandon completely in the relative blink of an eye?
- ianai 9y agoWell, for one, the doomed endeavors (if it actually is) are often worthwhile for the following reasons: -The technology that stems from attempting to answer the problem. -The unforeseen consequences - i.e. Maybe someday we'll reach technology that can detect signals in a more advanced way than we can currently and, through recording data from the past, have captured a signal years before that technology exists. -How many people buy into lotteries despite having awful odds? The odds may be bad, but it's non-zero.
- jcelerier 9y ago> The technology we have to send signals today will look completely pathetic to us when we look back on them in 50 years. the technology doesn't matter, either yesterday, today or tomorrow it will still be electromagnetic waves which is what SETI is analyzing.
- Dowwie 9y agoWe would get a response sooner if they communicated using more advanced technology
- mkl 9y agoHow? Any more advanced technology must still obey the laws of physics, and if we really are that wrong about the laws of physics, we'd have no way to receive such a message.
- ceejayoz 9y agoWell, there's stuff like wormholes, Alcubierre drives, etc. All problematic given our understanding, but a culture having made breakthroughs towards these might just show up on our doorstep one day. There are ways to receive messages that don't require the recipient to have the tech. An uncontacted tribe in the Amazon can still be reached by megaphone, or plane.
- naeemtee 9y agoTo be fair, in that situation the tribe can be reached because they DO have the tech: ears, eyes, etc. So we're still contacting them via tech they have.
- nine_k 9y agoReceiving a signal would be one of the more chilling things the Earth civilization can ever experience. Good thing if these guys would be on approximately the same stage as we are, but chances are slim. An answer from someone who knows about radio for 1000 years in much more probable than from someone who knows it for 100 years, as we do. Meeting the technologically more more advanced European expeditions did change the lives of the natives of the Americas, probably to the better, after a few centuries — if we ignore certain details.
- stephengillie 9y agoTwo possibilities exist: Either we are alone in the universe or we are not. Both are equally terrifying. - Arthur C Clarke.
- shellbackground 9y agoThird possibility: we do not exist either.
- eru 9y agoI'm with Descartes on this one.
- deleted 9y ago[deleted]
- pklausler 9y agoWe're pretty close to being capable of launching a Bracewell-von Neumann probe if some billionaire had the urge to do so. But so far as we can tell, the galaxy is not already full of self-replicating interstellar probes. Where are they? The uncomfortable implication is that we are the first/only species to get this far.
- jcoffland 9y agoThe observable universe is very large. It would be easy to miss all the action.
- cma 9y agoFrom the traveller's perspective, due to time dialation, they would get there a lot faster than that (even if that much time would pass on earth).