Before diving into solutions, it is important to understand the weight of the text you are dealing with. Often referred to as the "Big Orange Book" (or "BOB"), An Introduction to Modern Astrophysics is the gold standard for undergraduate and first-year graduate astrophysics courses.
Simply downloading the and copying the answers into your homework is a tragedy. You will learn nothing. Instead, use the "Modified Cornell Method" for problem-solving. an introduction to modern astrophysics solutions pdf