Astronomy; At present, the most famous book is A Brief History of Time, which is very academic and basically incomprehensible without professional knowledge. Astronomical novels and entertainment books are mostly science fiction. If you just want to gain some knowledge for entertainment, you should recommend Liu's works, including Three-body, which is a real science fiction novel, not a thriller set in science fiction. After reading it, you will definitely gain something.

Geography: You can read more about various tourist introductions of human geography, and recommend a self-help tour in China, which introduces the local customs of China in detail. After reading it, it's almost like I've been there myself. Of course, there is also an introduction to world tourism. Those who like world human geography can watch that.

If you want to read some books with a wide range of knowledge and strong entertainment, Verne's trilogy-Two Wan Li under the Sea, Mysterious Island, Captain Grant's children, and Journey to the Center of the Earth are highly recommended. Conan Doyle's Lost World is also good.

If simply expanding knowledge is not for entertainment, but also needs to be more widely understood, then the most ideal textbook is junior high school and senior high school, with extensive basic knowledge and foundation. If you go deeper, you can look at the textbooks of related majors in universities.

Recommend another astronomical book, Stars and Planets. It introduces the monthly starry sky, 88 constellations, astronomy, and eight main stars.