Word: neptunian
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Dates: during 1990-1999
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...instrumental in the discovery and subsequent research of the Kuiper Belt, which scientists believe is the source of short source comets. The belt of nearly 70,000 "trans-Neptunian" objects is believed to hold many clues to the formation of the solar system...
...were so alarmed to hear that Pluto might be demoted from "planet" to "trans-Neptunian object" by the International Astronomical Union that we asked our famed astrologers for their reactions...