Block out the Sun to Cool Down Venus
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To bring Venus’s temperature down to between 10 °C and 40 °C, you would need to block between approximately 63% and 76% of the Sun’s rays although due to the significant greenhouse effect, 90% might be more correct. The shield size needed for 90% blockage would be 17,500 km. The ideal point to place the shield is approximately 674,000 km from Venus.