Word: nereid
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Dates: during 1950-1959
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...Kuiper thinks that Pluto is an escaped satellite that once revolved around Neptune. The other satellites of Neptune, Triton and Nereid, may have escaped too, but eventually were recaptured. They tangled with the gaseous envelope that still surrounded the mother planet and were reduced again to the satellite status. Pluto, however, managed to keep its freedom until the sun had dissipated most of Neptune's gaseous envelope. Now it is probably safe for the life of the solar system...