Outline

Telescopes 119

4.1 Telescopes 120

Collecting Power 120

Focusing the Light 120

Extending Our Reach: Refraction 121

Resolving Power 127

4.2 Interferometers 128

4.3 Observatories 130

4.4 Detecting the Light 131

4.5 Observing at Nonvisible Wavelengths 131

Extending Our Reach: Exploring New Wavelengths: Gamma Rays 134

Extending Our Reach: Observing the Crab Nebula at Many Wavelengths 134

4.6 Observatories in Space 136

Atmospheric Blurring 137

Space Observatories versus Ground-Based Observatories 138

4.7 Going Observing 140

4.8 Computers 141

4.9 Astronomers 142

Projects 144

Overview 3 Stars 145

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