#astronomer__uranologist__stargazer  a physicist who studies astronomy
  supertype:  #physicist  a scientist trained in physics
  instance:  #Aristarchus_of_Samos  #Friedrich_Wilhelm_Bessel  #Nathaniel_Bowditch  #Anders_Celsius  #Nicolaus_Copernicus  #Sir_Arthur_Stanley_Eddington  #Eratosthenes  #Galileo_Galilei  #George_Ellery_Hale  #Asaph_Hall  #Edmond_Halley  #Sir_Frederick_William_Herschel  #Sir_John_Frederick_William_Herschel  #Hipparchus  #Edwin_Powell_Hubble  #Sir_William_Huggins  #Hypatia  #Johannes_Kepler  #Samuel_Pierpoint_Langley  #Pierre_Simon_de_Laplace  #Sir_Alfred_Charles_Bernard_Lovell  #Percival_Lowell  #Maria_Mitchell  #Johann_Muller  #Simon_Newcomb  #Omar_Khayyam  #Jan_Hendrix_Oort  #Benjamin_Peirce  #Ptolemy  #David_Rittenhouse  #Giovanni_Virginio_Schiaparelli  #Harlow_Shapley  #Willem_de_Sitter  #Thales_of_Miletus  #Clyde_William_Tombaugh
  subtype:  #astrophysicist  an astronomer who studies the physical properties of celestial bodies
  subtype:  #cosmologist  an astronomer who studies the evolution and space-time relations of the universe
     instance:  #Georges_Henri_Lemaitre__Lemaitre__Edouard_Lemaitre

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