8. The Sun

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The Sun is the most unique object in the Solar System, and a fair example of the most ubiquitous objects in the Milky Way: it is a star. Analysis of sunlight reveals that the Sun is made mostly of the elements Hydrogen & Helium, with just traces of other elements. The Sun maintains its high internal temperature by thermonuclear fusion.

Topics:

Reading:

    Ch. 2-3Einstein showed that light sometimes behaves as particles and sometimes as waves
    Ch. 2DISCOVERING SPECTRA (p. 46)
    Ch. 2-18Each chemical element produces its own unique set of spectral lines
    Ch. 2-21Spectral lines occur when an electron jumps from one energy level to another
    Ch. 7The Sun (p. 149)
    Ch. 7THE SUN'S ATMOSPHERE (p. 150)
    Ch. 7-1The photosphere is the visible layer of the Sun
    Ch. 7THE ACTIVE SUN (p. 153)
    Ch. 7-4Sunspots reveal the solar cycle and the Sun's rotation
    Ch. 7-5The Sun's magnetic field creates sunspots
    Ch. 7THE SUN'S INTERIOR (p. 159)
    Ch. 7-7Thermonuclear reactions in the core of the Sun produce its energy
    Ch. 7-8Solar models describe how energy escapes from the Sun's core

Web Resources:

Homework 8: Spectral Lines, due 10/23.

Quiz 8: Sun and Planets, given 10/18.


Joshua E. Barnes (barnes@ifa.hawaii.edu)

Last modified: October 18, 2001
http://www.ifa.hawaii.edu/~barnes/ast110/ts.html