LSU
ASTR 1102 -
Typical Galaxy
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ASTR 1102 002 2008 Fall Semester Joel E Tohline Alumni Professor Office 247 Nicholson Hall Slides from Lecture18 Chapter 23 Our Galaxy and Chapter 24 Galaxies Typical Galaxy Large collection of stars typically 10 11 stars held together by the mutual gravitational attraction of all the stars Gas dust dispersed throughout space between the stars interstellar medium Two typical geometric shapes Spiral Disk with central more spherical bulge Elliptical much closer in shape to a sphere than to a disk Schematic Illustration of Our Milky Way Galaxy Real All Sky Images of Our Milky Way Galaxy Stellar Populations Pop I Pop II Pop III
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