Encyclopedia
“An encyclopedia is a comprehensive reference work that provides detailed information on a wide range of topics or a specific subject area. Encyclopedias are typically organized alphabetically or thematically and are designed to serve as a reliable source of information for education, research, and general knowledge.”
Given below are links to some such sites that will help you enhance your knowledge beyond the text books.
https://www.nationalgeographic.com
https://science.nasa.gov/solar-system/