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astrophysics
subject			fact

astrophysics	has definition The science that studies the physics and chemistry of extraterrestrial objects. The alliance of physics and astronomy, which began with the advent of spectroscopy, made it possible to investigate what celestial objects are and not just where they are.
	is a kind of physics

Kinds of astrophysics :

• celestial mechanics (2 facts) - Study of the movements and physical interactions of objects in space; astrophysical mathematics.