Drake first presented his equation in 1961, and he maintained an interest in the question of extraterrestrial life throughout his career. While at Arecibo, he was involved in a project that beamed a message from that facility to a cluster of stars. He also helped craft two messages sent with our first hardware that was expected to leave the Solar System: a plaque on Pioneer 10 and 11 and gold records placed on the Voyager probes. He was also involved with the SETI institute and served on its board of trustees.
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