How Many Solar Panels Would It Take to Power The Entire World?

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After seeing how many nukes would it take to obliterate humanity instantly, I wanted some good news. Like, how many solar panels would it take to power the entire world? The entire surface of Africa, maybe? Actually, it's surprisingly less.

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Just 496,905 square kilometers. That's really nothing compared to the total world area: Less than the surface of Spain (504,030 square kilometers) covered with solar panels, distributed across deserts and areas with almost 24/7 sun, all year around.