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low contribution


Soviet Union

and the streets of New York. - first9 C pointing to a low contribution of ices to a comet's mass (dubbed the "icy dirtball" hypothesis). He also anticipated the era of artificial satellites and organized the members of Operation Moonwatch to track them. These groups were the only ones prepared and ready to make observations when the Soviet Union unexpectedly launched Sputnik I in 1957. He became director of the Smithsonian Astrophysical


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