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by LatteLazy
1824 days ago
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The L1 between earth and the sun is only 1% of the way to the sun. So the sail would need to be 99% of the cross sectional area of the earth. If it was opaque (reflective) and you only wanted to block 2%, you'd need a 2.23 million square km sail (0.020.99Pi*6000^2) Aluminium foil is about 2g/cm2. That's 3e-3 g/cm2. 3e-2 kg/m2. 30,000kg/km2. You'd need 66 million tonnes of aluminium. Maybe you can make it 100 times lighter with better materials? So only 600,000 tonnes. https://en.wikipedia.org/wiki/Lagrange_point Maybe if we'd gotten into asteroid mining 100 years earlier... |
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