Individual #radio_astronomy__radioastronomy  the branch of astronomy that detects and studies the radio waves emitted by celestial bodies
  >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

No statement uses or specializes radio_astronomy; click here to add one.