as·tro·phys·ics /ˌæstrəˈfɪzɪks/
 天體物理學


 As·tro·phys·ics n.   Astron. The science treating of the physical characteristics of the stars and other heavenly bodies, their chemical constitution, light, heat, atmospheres, etc.  It is a branch of astronomy.
 Note: ☞ Its observations were traditionally made with the spectroscope, bolometer, etc., usually in connection with the telescope.  In modern times, radiotelescopes, infrared telescopes, X-ray and gamma ray detectors and neutrino detection equipment located deep underground are all put into service to observe and test theories about astronomical phenomena.

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 astrophysics
      n : the branch of astronomy concerned with the physical and
          chemical properties of celestial bodies