Individual #astrophysics  the branch of astronomy concerned with the physical and chemical properties of celestial bodies
  >part:  #cosmogony  the branch of astrophysics that studies the origins and structure of the universe
  >part of:  #astronomy__uranology  the branch of physics that studies celestial bodies and the universe as a whole
     >part of:  #physics__physic__physical_science__natural_philosophy__naturalphilosophy  the science of matter and energy and their interactions

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