I have a master's degree in Chemical Engineering. Ever since I was a little kid universe and how it works have always kept me wondering. Now that I have an appropriate background, I think, in relevant math, physics, and chemistry, I would like to dig in a little deeper than a television documentary series on universe. I do not have money and time to go back to school and would like to teach myself. What books do you guys recommend. I do not mind if it takes years to fully understand, would like to mathematically solve, derive, express astrophysical concepts and ideas. I have to refresh my memories though. I plan to review Fluid Mechanics with my old textbook, An Introduction to Fluid Dynamics by G. K. Batchelor I plan to teach myself statistical mechanics with Statistical Mechanics by McQuarrie What books would you recommend after mastering the two books above? I wanted to learn Complex Analysis next. I am seeing that 2 books, Complex Analysis by Lars Ahlfors and Complex Variables (Dover Books on Mathematics) by Francis J. Flanigan are what I will get. Thank you in advance.