>>13843476>mass part of the problem.Well, by the time such thing is anywhere close to a problem we would be past chemical propulsion, which is pretty mass reliant, so that's one thing less to consider. Extracting materials and taking them to their destinations will be a pain in the ass. Depending on where you are constructing your... type-ii-civilization gizmos, you'd have several options as to where to get the material. The Oort Cloud is very impractical, but the mass is there:
>Its total mass is not known, but, assuming that Halley's Comet is a suitable prototype for comets within the outer Oort cloud, roughly the combined mass is 3×1025 kilograms (6.6×1025 lb), or five times that of Earth.Mercury is another one (0.0553 Earths, in term of mass), though you'd spend lots of energy getting in and out that deep in the gravity well.
The Asteroid Belt (0.000492 Earths, basically 4% our Moon's total mass) could help, again depending on what you are trying to do.
The downside of this is that once you are in need of great amounts of mass you start disassembling celestial bodies meaning that you can't settle or colonize those (inb4 o'neillchads, planetcuck, etc.). It's like a situation of not being able to have your cake and eat at the same time.
