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Several unis have their Astronomy and Astrophysics and Cosmology topics' lecture notes and more (as offered in undergraduate Bachelor Science physics courses available for easy download for free for anyone who is interested, not just students enrolled in that uni).
These are usually courses offered at 2nd and 3rd year level so some of the maths and requisit knowledge (of other advanced (2nd year and 3rd year physics electives and maths electives) make these lectures interesting but not for faint hearted. Hey if it was easy everyone would get degrees and they'd be worthless.
To get the most out these materials - acquiring the text book is very helpful as the notes are usually only a guide to the key ideas in these books.
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