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Sun gun
The sun gun or heliobeam was a theoretical orbital weapon.
==History==
The Scottish mathematician John Napier proposed such a device. In his book Secrete Inventionis (1596), he published details of a giant mirror to burn enemy ships by focusing the sun's rays on them.
In 1929, the German physicist Hermann Oberth developed plans for a space station from which a 100 metre-wide concave mirror could be used to reflect sunlight onto a concentrated point on the earth.
Later during World War II, a group of German scientists at the German Army Artillery proving grounds at 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 above Earth. The scientists calculated that a huge reflector, made of metallic sodium and with an area of , could produce enough focused heat to make an ocean boil or burn a city.〔 After being questioned by officers of the United States, the Germans claimed that the sun gun could be completed within 50 or 100 years.〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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