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"If it breaks on the 45,552nd time, we will redesign it so it doesn't break." — James Dyson, founder of Dyson

164,292 次观看 • 2 个月前 •via X (Twitter)

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Dyson Sphere by 2040? > Paul Christiano gave a 15% probability a Dyson Sphere by 2040 on Dwarkesh Patel > So I invited Jason Wright , astronomer and astrophysicist at Penn State, a specialist on detecting alien technological signatures to figure out whether it would be possible Highlights: On The Physics of Dyson Spheres > On the Ultimate Limiter - Cooling: "The only thing you can do is put out radiators and let the heat radiate away... you don't have a river nearby, you can't do water cooling, you can't blow fans across it. There's no air." > On Building Them Hot, Not Cold: "I actually expect the Dyson spheres to be as hot as possible if they're maximizing computation... I think these things will be room temperature or warmer." On Building A Dyson Sphere > On Disassembling Jupiter: "You could disassemble Jupiter and build a Dyson sphere... He [Freeman Dyson] worked out the details like, it's totally possible to disassemble a planet." > On the Impossibility of a Quick Dyson Sphere: "It is literally impossible to build a Dyson sphere around the sun that quickly [in 50 years]... It's not that I'm not being imaginative. It's that there's not enough mass. The mass is in Jupiter." > On the Sheer Energy Required: "If you took all the energy the sun puts out for 50 years and with perfect efficiency used it to lift mass off of Jupiter, you would still not have enough time." > On the Key Technology Required: "I think you have to invoke exponential growth. You need some way to have a runaway exponential that mines so much material, builds so many things... I think it's self-replicating machines, Von Neumann machines." On Detecting Alien Civilizations > On the Impossibility of Hiding: "It's very hard to hide the fact that you're using energy... you can't keep it, you'll melt everything. And when you get rid of it, it'll be obvious." > On How Easy They Are to Find: "Such a thing would be extremely detectable... Even if it only captured 1 or 2% of a star's light altogether, that would still be quite obvious. It would look quite anomalous." > On Finding a Hidden Civilization: "You can put on infrared goggles and you'll see who's got the heat on. Like the houses that that are warm on the inside... you can see the heat coming off of those houses." > On Ruling Out Super-Civilizations: "We were able to show that out of the 100,000 closest galaxies to the Milky Way, there aren't any of those [Type III civilizations]." On The Space Industry Wrecking Science > On the Perfect Spot for Alien Hunting: "Putting a radio telescope on the far side of the moon would be amazing... the moon acts as a shield and there's no radio frequency interference." > On the Threat to the Lunar Far Side: "As soon as you say, 'Alright, we want to build something on the far side of the moon,' everyone's like, 'Great, let's build the infrastructure'... and they set up all this wireless communication across the moon. And you're like, 'That defeats the entire purpose.'" > On the Impact of Starlink on Science: "Starlink went up and just completely wrecked all of our plans for astronomy... And now every time it takes a picture, it gets 'Starlinked.' That's what we call it. Big old streaks through every image." > On the Race to Study Mars: "We kind of got to hurry up and do all of our life detection experiments before boots hit the ground there... As soon as people go to Mars, we will contaminate it." This was by far the best pod I've done so far. Links below:

Prakash

43,295 次观看 • 9 个月前