A1258690579hGyYe

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The Milky Way Galaxy
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The Disk

• The spiral arms
• Population I type stars
• Density Waves
• Spiral tracers

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Herschels View

• Only saw a few thousand parsecs
• Dust obscured his view

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Galactic Coordinates

• Longitude is the angle around the plane
• Latitude is the angle above or below
• The zero direction is toward Sagittarius

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The Suns Orbit

• 8500 parsecs from the center
• 240 million years to orbit once

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Parts of the Galaxy

• The disk
• The nuclear bulge
• The halo

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The Nuclear Bulge

• Population II type stars
• A supermassive black hole?

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The Halo

• Globular clusters are found here

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