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TaoLibra said:
First of all: Regardless of construction materials (or where you get them), a Dyson Sphere would be useless because GRAVITY is impossible on the inner surface of a Dyson Sphere.
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Unless of course, gravity manipulation is part of having sufficiently advanced technology.
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If you have such godlike technology that you can convert matter into energy, then you already have an endless supply of energy.
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It's not completely endless. The stars are still converting large amounts of matter into energy, and you will eventually run out of matter to convert.
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If you can disassemble whole planets, and can control matter with the ease necessary to fabricate your hypothetical (and impossibly dense) Dyson Sphere & Ringworld building material, then why would you waste it building anything that's tethered to the gravity well of a star?
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Because you can?