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For those interested in the history of science, Project Gutenberg hosts thousands of public domain titles. You can find the original works of pioneers like Galileo, Kepler, and Newton.

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Astronomy is a fast-moving field. While the basics of physics don't change, information about exoplanets or dark energy should be from recent years. For those interested in the history of science,

If you are reading while stargazing, use a PDF app with a "Red Mode" to preserve your night vision. If you'd like to narrow down your search, tell me: Astronomy is a fast-moving field

It is completely free, legal, and available in high-resolution PDF format. 2. NASA eBook Library (Best for Space Exploration)

The physics of celestial objects, including gravity, light, and thermodynamics.