Introduction to astrophysics
From Wikiversity
Astrophysics (Astro = star, physics = nature) is the science that explores physics on a greater scale, aiming to explain the nature of space. These include the physical properties of stellar objects such as planets and black holes, the motion of extraterrestrial objects and the interstellar medium. An expansion of this is cosmology, which is theoretical astrophysics on a much larger scale.
Introduction to astrophysics is a 
