Cosmology
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Ernst Öpik
Lindsay (crater)
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A. David Andrews
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Armagh Observatory
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Gold Medal of the Royal Astronomical Society
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1985 in science
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Tully–Fisher relation
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1932 in science
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Bruce Medal
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Otto Struve
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Fred Lawrence Whipple
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1893 in science
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Lembit Öpik
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Spiral arm
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List of Estonians
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Andromeda (constellation)
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List of astronomers
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Andromeda Galaxy
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Timeline of knowledge about galaxies, clusters of galaxies, and large-scale structure
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White dwarf
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September 10
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Quasar
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October 22
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Oort cloud
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Galaxy
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Fred Singer
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Gravitational redshift
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Ernst Opik
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Ernst Julius Opik
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Ernst Julius Öpik
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Ernst J. Öpik
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Ernest Julius Opik
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