ASTR 170B2 Lecture Notes - Lecture 15: Earth Radius, Galactic Center, Planetary Science
23 Oct 2017
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Document Summary
Observations of cold co emission used as a tracer of molecular hydrogen h2; recall that motion around the galactic center are - 10^5 km hour. So we can easily measure the line of sight doppler shirt. Collapse of giant molecular cloud formed the sun and planets. The conversion of gravitational potential energy into heat ignited nuclear fusion. Reveals the similarities and differences between the planets- looking for trends, patterns, rules, exceptions. Helps us understand with physical processes shape the planets. Leads to a basic theory for the formation of the solar system. Helps us learn about other extrasolar planetary systems. Sun: very basic g5 star about 4. 5 g yr old. The sun is the largest object in the solar system. The sun contains more than 99. 85% of the total mass of the solar system. Its gravity regulates the orbits of the planets. It"s heat is a major factor in determining planet surface and atmospheric temperatures.
