Astro 1 ch 1
58:18
Astro 1 ch 2
52:14
Astro 1 ch 3
1:09:48
Astro 1 ch 5
59:17
Astro 1 ch 6
7:37
How Did Scientists Calculate the Sun’s Mass?
1:01:35
Astro 1 ch 4
14:47
Orbital & Escape Velocity, Inverse Square Law, Newton’s Universal Law of Gravitation, Weightlessness
1:15:03