Andromeda galaxy M31
Andromeda galaxy M31. Milky Way galaxy similar to M31. Model of Milky Way, diameter 100,000 ly. Central bulge radius 6,000 ly. Thickness of spiral arms 2,000 ly. Globular cluster. Nebula. Open cluster. Sun location is in spiral arm, 2/3 from the center to the edge. Fig. 15-10a, p.299.
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