In physics, the invention of nuclear fission in the Atomic Age led to both nuclear weapons and nuclear energy. Computers had been invented and later shifted from analog to digital in the Digital Revolution. Information technology, particularly optical fiber and optical amplifiers led to the birth of the Internet, which ushered within the Information Age. The Space Age started with the launch of Sputnik 1 in 1957, and later the launch of crewed missions to the moon within the Nineteen Sixties. Organized efforts to search for extraterrestrial intelligence have used radio telescopes to detect signs of technology use, or technosignatures, given off by alien civilizations.
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