Class Notes 3/25

Newton's Universe:

1. Infinite size
2. Infinite number of stars
3. Infinite age
4. Homogeneous distribution of stars

H-R Diagram:

• X-Axis: Temperature in K (Note: increases from right to left)
• Y-Axis: Luminosity in Watts
• Main Sequence: made up of dwarf stars (mostly red dwarfs)
• White Dwarfs: below the main sequence, near the lower left corner of the graph
• Cepheid Variables: near the center of the graph, slightly above the main sequence