Making a sunshade big enough to do an effective job requires a fairly massive installation. It has to balance gravitational forces at the same time it has to resist solar radiation pressure. Essentially, Szapudi sees a shield made of lightweight materials tethered to a massive counterweight .
In the system Szapudi describes, the counterbalance would “ride along” the sunward side of the shield. The mass of the asteroid would help reduce the weight and mass of the shield itself. The system would then operate to reduce solar radiation by 1.7%. Theoretically this is about what you’d need to avoid a catastrophic rise in global temperatures.
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