ASTR 1102-002 2008 Fall Semester Joel E. Tohline, Alumni Professor Office: 247 Nicholson Hall [Slides from Lecture18]

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ASTR 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 ~ 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