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Originally Posted by waffe23
Also i'm going to go out on a limb and say that the Dyson sphere is frankly ridiculous. To even entertain the notion that we could build something like that is beyond absurd. I mean are there even enough metals (or whatever new crazy material would be needed that hasn't been invented/discovered yet) to make such a thing? Not on earth? Oh but I guess we'd get that stuff from other planets or solar systems or something. Right after we get past that Mars mission that's slated to get somewhere close to real in the 2030's. I mean hell we're not even sending space shuttles up anymore. The whole expanding to the stars thing Nick was mentioning is a fairly tale. We have to make do with the Earth. So I don't know where I'm going with this but I think I agree with Nick that we have to do something about the asteroid thing but not about the crazy Ray Kurzweil life extension stuff. That is all.
The Dyson sphere is actually a broad class of different hypothetical megastructures. You seem to be talking about the Dyson shell, which I happen to agree is kind of out there. I think a Dyson swarm is far more plausible. When aliens want to colonize our solar system, that's what they're going to send their self-replicating bots to build. The mass of the Earth, asteroids, and other inner planets could be converted to small orbital habitats that, in total, present a far larger total surface area to the Sun and, therefore, capture a much greater amount of the Sun's energy output per kilogram of material used. It would also create millions of times as much livable space for organisms to occupy. The solar system could house trillions or quadrillions of occupants instead of mere billions on the surfaces of planetary bodies.
When it comes to
us building something like that (as opposed to the aliens who take possession of our solar system building it), I think it is going to be a long time before it happens. Like I said, probably at least 1,000 years. If you consider the
Kardashev scale, then a civilization housed in a Dyson swarm and effectively using all of a star's energy would be a Type II civilization. At present, we are not even a Type I civilization (we're about a type 0.72 civilization), and will not achieve Type I status for another 100-200 years; Type II status is hypothesized to come in "a few thousand years." I'm optimistic though so I think it can be done in a 1,000 or so years.
Anyway, as for making do with Earth, I don't think that's a viable longterm option. The energy required to fuel our increasingly advanced and complex society and technology, and the resources and space to back said energy production will require us to move beyond our planet and out into the solar system, and eventually beyond. Maybe not in our lifetimes though, and definitely not in our lifetimes if we get smashed by an asteroid first.