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Crash Course Astronomy
Telescopes: Crash Course Astronomy #6
Today Phil explains how telescopes work
Crash Course Astronomy
The Gravity of the Situation: Crash Course Astronomy #7
Phil looks at how gravity plays out across the universe.
Crash Course Astronomy
Tides: Crash Course Astronomy #8
What is the relationship between tides and gravity?
Crash Course Astronomy
Introduction to the Solar System: Crash Course Astronomy #9
Phil takes a look at the explosive history of our cosmic backyard.