Eternity in six hours: Intergalactic spreading of intelligent life (2013)

https://www.researchgate.net/publication/256935390_Eternity_in_six_hours_Intergalactic_spreading_of_intelligent_life_and_sharpening_the_Fermi_paradox

23•wallflower•2h ago

Comments

GTP•1h ago

This isn't my field, but I see a huge gap between what in the abstract they say it would be feasible for us and what we're currently capable of. I mean, we're able to send space probes around, but self-replicating space probes and Dyson spheres feel on another level. Am I the only one?

sejje•56m ago

Do we have anything that self-replicates physically?

Software, sure. I know 3D printer folks will sometimes 3D print parts for new machines. But nothing that fully replicates itself, right? Especially autonomously.

Maybe we'll see what a moon base can bring us.

GTP•51m ago

Additionally, you also have to consider that a self-replicating space probe should be able to find, retrieve, and process the raw materials needed to build new probes on its own. A 3D printer can print some of its own parts, but with externally-provided material that it isn't able to produce on its own.

diziet•35m ago

Basically all of life is self replicating, physically.

psychoslave•15m ago

I guess the OP meant something that is more flatous for human vanity to feel like a demiurge when at most it would be a tool of cosmos in its experiment.

gmuslera•1h ago

"And with this papyrus, we conclude that in five thousand years, mankind will finally build a staircase to the Moon"

fogof•53m ago

I recently saw an interesting criticism of this paper: That by the end stages of the disassembly of Mercury, the amount of heat generated would be so much as to melt the surface, calling into question whether the mass driver system could work at such a high rate.

V__•39m ago

Has someone answered why a civilization would send "von Neumann probes" or similar into space? It would take so long for any answers from those probes to arrive that there really doesn't seem much value in them.

soraki_soladead•32m ago

We don't know however "It would take so long" is an anthropomorphic assumption of time scale.

qingcharles•10m ago

Right. We have no idea how another species perceives time. This could be nothing to them.

And even if they do perceive it like us, that hasn't stopped humans from great projects. How many generations did it take to complete Stonehenge or the Great Wall of China? We're still on top of Voyager too after 50 years.

anbende•28m ago

Well, if you personally were building von Neumann machines do any purpose in the solar system, would YOU be interested in sending some to neighboring systems knowing that you could conceivably get a response in your lifetime.

Would you be at all interested in expanding that project to outlast you?

And even if you personally wouldn’t be so inclined, surely you know or have met people who might?

Once you have the self replication, expanding scope may just be additional code…

loandbehold•15m ago

You can ask same question about any decision that outlasts you. E.g. why write a will for your children?

satisfice•27m ago

Can we have a science paper that explains why we can colonize Andromeda but we can’t build high speed rail?

psychoslave•14m ago

Because we don't refer to the same entities in each case?

gcanyon•21m ago

No humans go, no information returns.

Sending an acorn-sized probe to another galaxy to make more acorn-sized probes: what even is the point of that? To make very slow grey goo a reality?

If actual humans find a way to go to Andromeda (other than waiting for it to arrive, heh) and want to, good for them. Otherwise we should actively discourage anything like the project proposed

polotics•15m ago

Is there already a name for that effect where grandiose plans somehow appear to be more feasible than the simple mundane step-by-step issues resolution that even though they clearly stand in the way of said grand plans, are not worth investing thought and effort in?

When it comes to software projects my pet-name for it is the "big-bang theory", but in the article's domain that's kind of already taken.

hollerith•11m ago

"Far-mode thinking".

https://www.lesswrong.com/w/near-far-thinking

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