Eli5: What facts are holding humanity back from creating a Dyson sphere in reality?

Question

Eli5: What facts are holding humanity back from creating a Dyson sphere in reality?

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Answer 1

Fundamentally, everything everyone else has said AND Dyson Spheres don’t actually work in practice from an engineering perspective UNLESS you could build the whole thing essentially instantly. Orbital mechanics is a serious and complicated process that has to be taken into account during the building process (even assuming all of the other factors are taken care of) and, at some point, the stuff you put into space to build the thing will either a) fall into the sun, b) fling itself out into space, or c) begin colliding with the other stuff up there that you’re trying to attach to it.

Auch better and actually possible construction is a Dyson Swarm or a Niven Ring, but both of these also have their 6-levels of tech problems along with other issues…