天文学
01 Introduction to Astronomy_ Crash Course Astronomy #1
02 Naked Eye Observations_ Crash Course Astronomy #2
03 Cycles in the Sky_ Crash Course Astronomy #3
04 Moon Phases_ Crash Course Astronomy #4
05 Eclipses_ Crash Course Astronomy #5
06 Telescopes_ Crash Course Astronomy #6
07 The Gravity of the Situation_ Crash Course Astronomy #7
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