Frits Zernike
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What links here
Jacobus Kapteyn
Heliocentrism
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Galton board
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Kapteyn's Star
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Gerard Heymans
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Barneveld (municipality)
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List of Dutch people
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Ejnar Hertzsprung
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List of astronomers
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Interstellar medium
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Dendrochronology
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1851
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1922
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January 19
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June 18
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Galaxy
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Dark matter
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