The Science of the Solar System (Caltech, Mike Brown)
by Mike Brown · California Institute of Technology
Nine-week Caltech planetary science course, freely hosted with lecture videos, quizzes and unit tests, organized around four research questions: water on Mars, giant planet interiors, small bodies, and habitability. Students reason from spacecraft evidence rather than memorizing facts. The best free accessible entry point in the field: taught by a working planetary astronomer, structured around open research questions instead of a facts tour, explicitly pitched from high-school through intro-graduate level, and fully free on Brown's own Caltech site.
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