Later during World War II, a group of German scientists at a research centre in Hillersleben began to expand on Oberth’s idea of creating a superweapon that could utilize the sun’s energy. This so-called “sun gun” would be part of a space station 5,100 miles above Earth. The scientists calculated that a huge reflector, made of metallic sodium and with an area of 3.5 square miles, could produce enough focused heat to make an ocean boil or burn a city.After being questioned by Allied officers, the Germans claimed that the sun gun could be completed within 50 or 100 years.
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