GEOL 101 1st Edition Lecture 18 Outline of Last Lecture I. Review and test thingsOutline of Current Lecture I. Why does the sun shine?II. Sun's structureIII. Nuclear fusionCurrent Lecture I. Why does the sun shine? --The sun is not on fire, it is powered by nuclear energyII. What is the Sun's structure? a. The weights of its upper layers compress its lower layers. Nuclear reactions only occur in the sun's core where it is hottest.b. Radius- 109 times Earth's, c. Mass- 300,000 times Earth'sd. Luminosity- 3.8 x 10^26 wattse. With these values, we can calculate how much mass the sun is converting into energy. f. Parts of the sun (in no particular order): Core, radiation zone, convection zone, photosphere, radiation zone, chromosphere, corona, solar wind, sunspotsIII. Nuclear fusion in the suna. Fission: making 2 nucleus from one; Fusion making one nucleus from 2 nuclei sticking togetherb. High temperatures allow fusionc. PP chain in the sun (proton-proton chain): pressing 4 protons (hydrogen nuclei) together and releasing some energy, forming helium.d. What would happen inside the Sun if a slight rise in core temperature let to a rapid rise in fusion? --it would expand and then cool down.These notes represent a detailed interpretation of the professor’s lecture. GradeBuddy is best used as a supplement to your own notes, not as a
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