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Galaxies

• 21
• APOD: Milky Way
• NASA's "Astronomy Picture of the Day" index to Milky Way images.

• 22
• Milky Way
• Provides images of our galaxy taken at different wavelengths, and discusses how the mapping of variable stars, neutral hydrogen radio maps and star clusters gives us a view of the shape of the galaxy.

• 23
• The Milky Way
• A short definition of the Milky Way's components and composition.

• 24
• The Milky Way Galaxy: Our Home
• A brief illustrated definition of the Milky Way.