By the 1960s, two major contributions were made to the field of SETI, both of which considered how more advanced civilizations could be found based on the types of structures they might build and the levels of energy they could harness.
By the 1960s, two major contributions were made to the field of SETI, both of which considered how more advanced civilizations could be found based on the types of structures they might build and the levels of energy they could harness.
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