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German mathematician and astronomer who made accurate measurements of stellar distances and who predicted the existence on an 8th planet (1784-1846) Bessel , Friedrich Wilhelm Bessel
United States astronomer who developed a theory of stellar evolution (1877-1957) Henry Norris Russell , Henry Russell , Russell
unit of astronomical length based on the distance from Earth at which stellar parallax is 1 second of arc; equivalent to 3.262 light years parsec , secpar
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