Topics: Comet, Solar System, Jupiter Pages: 3 (886 words) Published: March 31, 2013
Learning Module 3
Connor MacLeod

The first video, The Solar Nebular Theory, describes the planetary formation through a collapsing cloud of dust and gas that spins in the same direction at a fast pace. Through angular momentum, as it collapses even more, it speeds up and flattens into a disk. As it flattens, the materials start to come together and planets start to form as well as a young star is created in the middle. What I liked about the video is how they used good analogies such as the pizza and the figure skater to get the idea of angular momentum across. What I didn’t like about the video is how they didn’t go more in depth about the other bodies that are created around the star. To make it better I would’ve used our solar system as an example in order to relate to it better

The 2nd video is the Planetisimal video. It goes on to describe how particles grow by condensation, the process of adding matter to an atom or molecule. Once they get to a big enough size, the particles start to stick to others through a process called accretion. Planetisimals continue to grow by colliding and sticking to others until it gets large enough to turn into a protoplanet. The stage where iron falls to the core and heat is generated while lighter materials stay on the outside to create the earths crust. What I did not like about the video is how they do not specify how long it takes for it to turn into a protoplanet from a planetisimal. The woman talks about millions of years to get to the diameter of the particle to centimeters until they start to collide, but lacks the information of how long the collisions take to get bigger. They could improve the video by adding these details into it. What I liked about the video is how it goes in depth about protoplanets and the gravitational collapse as the textbook had me somewhat confused.

The 3rd video is the extra solar planets. It is about how to detect planets outside of our solar system that gravitate around...
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