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Optical observations of artificial Earth satellites by the Smithsonian Astrophysical Observatory grew from a concept in the mind of Dr, Fred Whipple, which he expounded sixty years ago at a gathering of artificial satell
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Document Date: 2014-10-03 13:18:50
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Optical observations of artificial Earth satellites by the Smithsonian Astrophysical Observatory grew from a concept in the mind of Dr, Fred Whipple, which he expounded sixty years ago at a gathering of artificial satell