Live data from Hacker News

“Most promising signs yet” of alien life on a planet beyond our Solar System

skyatnightmagazine.com

311–320 of 365 posts

Re: “Most promising signs yet” of alien life on a planet beyond our Solar System

#311
post #101

Earlier quoted context omitted.

>we are only aware of one species that developed civilization building capabilities. well, the first one just doesn't leave any chance for any other one. >Life might be very common, but intelligent life still be incrediblY rare. the time period between big ape and nuclear bomb is extremely short - few millions years. In a hundred or a thousand - doesn't really matter - years we'll be an interstellar species or may be…

Unlikely we will ever be interstellar. The technology involved is speculative and the physics barriers needed to be surpassed are impossible and not well understood. To reach another star by the laws of physics involves many human lifetimes and that’s just the nearest star. That in itself makes it more likely that we will never be interstellar.

"Roundtrip Interstellar Travel Using Laser-Pushed Lightsails"

https://ia800108.us.archive.org/view_archive.php?archive=/24...

Re: “Most promising signs yet” of alien life on a planet beyond our Solar System

#312
post #54

Earlier quoted context omitted.

While it has more time to become a red giant, it'll become more luminous over time and life on Earth will be impossible much earlier. I've seen estimates of 0.5B to 1.5B years.

Nothing a bit of stellar lifting would not fix[1]. Or worst case, move to a bunch of habitats orbiting stellified Jupiter[2]. [1] https://en.m.wikipedia.org/wiki/Star_lifting [2] https://www.orionsarm.com/eg-article/4a48d58c84350

That's not the point: if you have capabilities to do stellar lifting, interstellar travel is likely on the table too. Fermi paradox is about the question, why we can't detect any sign of extraterrestrial civilizations out there. One explanation is that while life in general might be relatively abundant, true sentience as in us humans that allows life to spread besides its cradle might be quite unique.

Re: “Most promising signs yet” of alien life on a planet beyond our Solar System

#313
post #101

Earlier quoted context omitted.

>we are only aware of one species that developed civilization building capabilities. well, the first one just doesn't leave any chance for any other one. >Life might be very common, but intelligent life still be incrediblY rare. the time period between big ape and nuclear bomb is extremely short - few millions years. In a hundred or a thousand - doesn't really matter - years we'll be an interstellar species or may be…

Unlikely we will ever be interstellar. The technology involved is speculative and the physics barriers needed to be surpassed are impossible and not well understood. To reach another star by the laws of physics involves many human lifetimes and that’s just the nearest star. That in itself makes it more likely that we will never be interstellar.

>The technology involved is speculative and the physics barriers needed to be surpassed are impossible and not well understood.

we can build with today's tech - classic nuclear reactor plus ion drive - a 3 stage ship reaching 1000km/s, 1200 years to the closest star. Once we get to fusion, we'll be able to improve that speed a small order of magnitude.

>To reach another star by the laws of physics involves many human lifetimes and that’s just the nearest star. >That in itself makes it more likely that we will never be interstellar.

That is exactly what makes it _inter_stellar:) We'll have generations - 10-15 to the nearest star with the current tech mentioned above - of people living their lives on those ships. Living on a planet will become a strange thing for them.

I think in 10-20 years, once launching into LEO becomes cheap with Starship, companies, universities and wealthy individuals will be launching solar + ion drive and nuclear + ion to all the places in the Solar System and some automated probes - beyond.

Re: “Most promising signs yet” of alien life on a planet beyond our Solar System

#314

Earlier quoted context omitted.

It's also largely bunk. More a story than a hypothesis, really. Game theory shows cooperation beats aggression on a long enough timescale. Politics shows alliances and MAD deters first strike. Even actual "dark forests" are full of animals that have bright colors and make loud noises.

I really wish natives of places we discovered knew about this. they could've evaded all the bad parts and just explained how it is just a story.

The Indigenous peoples of the Americas knew well enough about the value of cooperation and alliance. That's why they had stuff like the Iroquois Confederacy, and switched between working with the British, the French, and the colonies depending on which was best for each individual group of natives at any one time. To present them as pure victims powerless before the might of white settlers undermines the political and cultural agency that Native peoples in fact had, and exercised.

The predominant form of relationship between European and Native American peoples for hundreds of years was trade, not war. The tragedies and the atrocities that resulted were a slow burn of conflicting interests and epidemiological naïveté, both between Europeans and Natives and also within each group. That's quite different from the hiding and decapitation strikes usually presented as "dark forest hypothesis", because there's no reason that those specific interests and ignorance would carry over to interstellar society (and every reason that they would need to be overcome in order to become interstellar in the first place).

But why do people always use the fate of resource-constrained preindustrial societies (both Europe and America) to try to predict relationships between hyper-advanced Kardashev-level civilizations anyway? It really seems to me like some kind of projected shame. You can see this too with Liu Cixin. He came from a country that was recently dominated, and has more recently been preparing to dominate its neighbors, so his story pretends nothing better is possible. I suppose that's comforting for some, and questioning it brings out people who show what it's really about.

Google Trends shows the top 10 countries for "Dark forest hypothesis" include the US, Taiwan, China, Peurto Rico, HK, Canada, and Aus [1]— Places with a prominent recent or ongoing imperial history, whether as victims or victimizers. I actually find the "dark forest" narratives quite disturbing, not as a prediction of our future, but as a window into the psyche of people who seem to want it to be one.

You might as well say the Romans had a slave-based economy, so therefore spacefaring empires must also be looking for human slaves! That's got exactly the same amount of validity as the Native comparison. But economic and military incentives obviously change as technology and culture develops. If anything, the fact we used to kill a lot of natives, and we don't so much anymore, is a strong sign that advanced societies can trend towards being less genocidal.

1: https://trends.google.com/trends/explore?q=%2Fg%2F11jyk5h9nj...

Re: “Most promising signs yet” of alien life on a planet beyond our Solar System

#315

Earlier quoted context omitted.

Someone has to be the first.

So, your theory is aliens are abundant, but by extreme coincidence we're first?

We haven't visited any other planets so we're not the first either.

Re: “Most promising signs yet” of alien life on a planet beyond our Solar System

#316
post #165

Earlier quoted context omitted.

It's also largely bunk. More a story than a hypothesis, really. Game theory shows cooperation beats aggression on a long enough timescale. Politics shows alliances and MAD deters first strike. Even actual "dark forests" are full of animals that have bright colors and make loud noises.

Cooperation depends on you and your potential allies surviving long enough to be able to contact each other, and being strong enough to counter the threat. We don't know whether we will develop capabilities fast enough to counter an enemy that e.g. at the first sign of radio started accelerating a bunch of super-dense (hence small, hard to detect and stop) kinetic kill devices our way. MAD is utter bunk. It depends o…

Cooperation only depends on anyone, in the history of ever, having at any point survived long enough to contact each other and form an alliance. Once a critical mass of parties that prefer cooperation has been reached, all future cooperative parties are at an automatic advantage over aggressive parties.

You can see shades this of this, e.g., in the difference between single-round versus iterated Prisoner's Dilemmas.

> MAD is utter bunk. It depends on rational actors that also believes the other actors are rational. Even Reagan realised the folly of MAD after Able Archer in 1983, and realising the Soviet leadership genuinely seemed to believe the US might be prepared to strike first.

What do you think the long-term prospects are of a species that goes around flinging RKVs at people? No more North America and no more Eurasia, if that happened. Maybe South America and Africa can pick up the pieces. Just because irrational hyperaggressive actors can briefly exist doesn't mean you're likely to encounter them. They won't survive for long.

MAD exists whether or not any particular participant believes in it, because it's just the cause and effect of competing powers each with their own agency. Or else we wouldn't be here. Even the Soviets knew that a possible US first strike was better than a guaranteed US retaliatory strike, which would happen if they struck first.

> Cooperation might eventually win out, but that won't help you if your civilization has long since been wiped out.

The whole "Fermi Paradox" arguments are based on an extreme form of "eventually, we should expect to see aliens, so why haven't we already?" This doesn't mean aggressive civilizations don't exist, but the reasons to think they're prevalent are overblown.

Re: “Most promising signs yet” of alien life on a planet beyond our Solar System

#317

Earlier quoted context omitted.

We don't even need to look at other species. Humans have been just as smart as you and me, maybe even smarter according to cranial measurements, without inventing anything that significantly changed their way of life. There could be loads of planets with prehistoric humans, having a fine time hunting with bows and picking fruit.

I think by the time we get to modern humans it would only be a matter of time for technology to develop to something like the current stage. The main evidence I can think of is the independent development of agriculture in about 4-5 regions, and the independent development of large complex civilizations in the Americas and Eurasia. Humans are cultural learners, so this allowed cumulative cultural evolution from at le…

I think it only takes a small tweak for everything to stall.

Suppose say, that people only trust a small group. Extended family and lifelong friends, for instance. People get very violent as soon as they disagree on something, immediately wanting to settle disputes by force.

Nobody can strike a deal to do anything with anyone outside their group, and you certainly can't make agreements with a guy in Seattle to deliver things to London. You can't mine coal hoping to sell it to an as yet unknown person. There's no point in fishing more fish than you and your friends can eat.

What happens in this world? Well, I think people will still be intelligent. They'll still think about social situations, especially when it comes to mating. There will still be stories, and humor.

But we're not advancing tech, and we're not changing economically.

Why do I say it's a small tweak? Well, we've all met people who seem to not be able to work with anyone. It's not unlikely that out in the stars, there's some planet with people who have everything we have, but they can't get things to work.

Re: “Most promising signs yet” of alien life on a planet beyond our Solar System

#318
It would be somewhat worrisome to actually find signs of primitive extraterrestrial life because of the Fermi Paradox. Given the age of the universe, and how long it took both complex life to develop on earth and for a creature such as us to emerge from that, finding life elsewhere would beg a return to Fermi's question of "Where is everyone?" implying that something comes along and causes evolving civilizations to be exterminated before they ever show signs to their presence to the wider galaxy.

If life, even of a very primitive sort, were found, it would stand to reason that it had done so in the past and that other civilizations, possibly even many of them, had formed in our huge galaxy long ago, giving them time to develop enough to be detectable even to us, so then, where are they?

Then again of course, there are probably many, many known unknowns and unknown unknowns lurking amidst all of the above supposition.

Re: “Most promising signs yet” of alien life on a planet beyond our Solar System

#319

Earlier quoted context omitted.

Nevertheless, if abiogenesis is common & intelligence is easy for evolution conditional on abiogenesis, the number of explanations for the Fermi Paradox just shrunk by a great deal, increasing the probability of the remaining explanations.

I doubt there is one single grand answer for the Fermi Paradox. Probably it's lots of smaller blockers which all stack up with each other. The chance of life forming, the chance that it becomes multicellular, the chance that it develops complex nervous systems, intelligence, the physiological hardware for tool use and creation, not stagnating or getting wiped out, having the inclination to look out and broadcast thei…

The paradox would remain valid in my view. Even with all those stacked difficulties and plausibility levels, the galaxy alone is immense and if life of any kind were to be found, i'd argue that we should be able to see signs of sophisticated life somewhere at least, so where is it? It's still a cause for some speculation and maybe even existential worry.

Re: “Most promising signs yet” of alien life on a planet beyond our Solar System

#320

Earlier quoted context omitted.

We don't even need to look at other species. Humans have been just as smart as you and me, maybe even smarter according to cranial measurements, without inventing anything that significantly changed their way of life. There could be loads of planets with prehistoric humans, having a fine time hunting with bows and picking fruit.

I think by the time we get to modern humans it would only be a matter of time for technology to develop to something like the current stage. The main evidence I can think of is the independent development of agriculture in about 4-5 regions, and the independent development of large complex civilizations in the Americas and Eurasia. Humans are cultural learners, so this allowed cumulative cultural evolution from at le…

Humans only started planting grain about 12k years ago. Anatomically modern humans were gathering wild grain, but not planting grain, for about 100k years. Given this very long period of stagnation, I don't think humanities ascension was an inevitability.
Post reply on HN