The sun has all the energy we could ever conceivably need, but we haven't been all that efficient in harvesting that energy ...yet. One way to capture the sun's energy is to build a Dyson sphere, or a megastructure surrounding the sun. Kurzgesagt explains how that could happen, which involves an army of robots launching umbrellas with a rail gun from Mercury. -via Geeks Are Sexy
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Nothing wrong with dreaming about such mega-projects. Science fiction motivates us to progress.
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I duno what's wrong with me, but everytime someone starts talking about dyson spheres all I can think of is a big vaccum in the sky.
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