As`tro*phys"ics (?), n. [Astro- + physics.] (Astron.) The science treating of the physical characteristics of the stars and other heavenly bodies, their chemical constitution, light, heat, atmospheres, etc.

&fist; Its observations are made with the spectroscope, bolometer, etc., usually in connection with the telescope.

As`tro*phys"ics (?), n. [Astro- + physics.] (Astron.) The science treating of the physical characteristics of the stars and other heavenly bodies, their chemical constitution, light, heat, atmospheres, etc.

&fist; Its observations are made with the spectroscope, bolometer, etc., usually in connection with the telescope.

• The branch of astronomy or physics that deals with the physical properties of celestial bodies and with the interaction between matter and radiation in celestial bodies and in the space between them.