Re:A Dyson sphere around a black hole
by mclightning on Thursday August 19, 2021 @05:10AM
(#28231802)
Because you can build a more efficient one? You could make it portable, controlled, modular etc etc
Yeah. All needed for interstellar travel for example. But for manufacturing planets?
Re:A Dyson sphere around a black hole
by mclightning on Thursday August 19, 2021 @05:33AM
(#28231903)
Why would you want to manufacture a gravity well? There are plenty of them
How many earth sized planets do we have in our solar system?
Re:A Dyson sphere around a black hole
by mclightning on Thursday August 19, 2021 @05:39AM
(#28231941)
If you're limited by the compounds available within the solar system, you should forget about building a dyson sphere for other reasons, or building a planet, or any kind of activity that will disturb the orbits of planets.
Few planets are similarly sized as Earth already btw, although with varying densities.
Ok, earth sized is mainly about 1 g. So yes, also with earths density to be precice. That leaves only venus as a existing alternative.
And I just assume that a civilisation advanced enough to build a dyson sphere, can handle the non trivial orbital mechanics, too. But maybe still cannot travel FTL. So indeed rather choose to build planets, or planet sized space stations.
That would require lots of energy and maybe the need to harvest the sun directly and control the light going out towards the planets.
Lets say, you want to manufacture new planets/planetary sized spaceships. You would need very big fusion reactors and you probably want to save the special fusion fuel for those, when they are on their voyage to other worlds. Because then they need fusion.
But why build a fusion reactor, when you already have a big one avaiable?