ASTR 3 Lecture Notes - Lecture 6: Orion Nebula, Kuiper Belt, Solid Surface
Document Summary
Week 3 lec 2: what does the solar system look like, sun and many other smaller objects: planets, their moons and rings, and such. Inventory: the sun, a star that is brighter than about 80% of the stars in the galaxy, is the most massive member of the solar system. As the nebula shrinks, its motion causes it to flatten 3. The nebula is a disk of matter with a concentration near the center : formation of the protosun. Direct observations: why are there 2 types of planets, when all planets are formed from the same nebula, temperature! It was much hotter closer to the sun, much cooler farther away. What condenses from a gas to a solid depends on temperature: the frost line. Inside the frost line: too hot for hydrogen compounds to form ices. Smaller denser regions within nebula can collapse more quickly than the rest.
