1. The most difficult part for me was following the physics equations stuff like angular momentum and rotational velocity.
2. There were a lot of interesting parts. Like how dark matter is just unobserved mass, and that the current thought is it exists in a halo form. Also, the way we weigh the mass of the sun was pretty interesting. I liked how dark matter is calculated although I see a lot of room for error in that calculation. (just like he does)
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