Astro 1050     Fri. Mon. 10, 2003

The Period-Luminosity Relationship

Calibrating the Period-Luminosity Relationship using Proper Motion

Globular vs. open clusters

The Distribution of Globular Clusters

The Shapley-Curtis Debate:  1920

The Andromeda Galaxy

M51:  The Whirlpool Galaxy

Sensing Hydrogen Gas

The Structure of our Galaxy

Disk vs. Halo Orbits

Differential Galactic Rotation

The Galactic Rotation Curve

Stellar Population and Galaxy Evolution

Traditional Model of Galaxy Evolution

M51:  The Whirlpool Galaxy

Possible Origin of Spiral Arms

Degree of Organization
 of the Spiral Arms

Degree of Organization
 of the Spiral Arms

Tracing the Spiral Arms

M51:  The Whirlpool Galaxy

Density Wave Theory

M51:  The Whirlpool Galaxy

Self Sustaining Star Formation

Two limiting cases of spirals

The Nucleus of the Galaxy

A movie of stars at the core