The Solar System
CHAPTER 6 | LIGHT AND TELESCOPES 105 Resolution and Precision What limits the detail you can see in an image? All images have li ...
106 PART 1^ |^ EXPLORING THE SKY the air fl ows smoothly and is not turbulent. Building an obser- vatory on top of a high mounta ...
CHAPTER 6 | LIGHT AND TELESCOPES 107 Infrared telescopes have fl own to high altitudes under balloons and in airplanes to get ab ...
108 PART 1^ |^ EXPLORING THE SKY New-Generation Telescopes For most of the 20th century, astronomers faced a serious limita- tio ...
CHAPTER 6 | LIGHT AND TELESCOPES 109 Adaptive Optics Not too many years ago, astron- omers thought it was pointless to build mor ...
110 PART 1^ |^ EXPLORING THE SKY The traditional telescopes described on this page are limited by complexity, weight, and Earth’ ...
CHAPTER 6 | LIGHT AND TELESCOPES 111 2 (^3) 3a Grinding a large mirror may remove tons of glass and take months, but new techniq ...
112 PART 1^ |^ EXPLORING THE SKY artifi cial star in the fi eld of view. Th e adaptive optics system can use the artifi cial sta ...
CHAPTER 6 | LIGHT AND TELESCOPES 113 parallel grooves scribed onto its surface. Diff erent wavelengths of light refl ect from th ...
114 PART 1^ |^ EXPLORING THE SKY Because astronomers understand how light interacts with matter, a spectrum carries a tremendous ...
CHAPTER 6 | LIGHT AND TELESCOPES 115 moon. Fortunately, radio astronomers can combine two or more radio telescopes to form a rad ...
116 PART 1^ |^ EXPLORING THE SKY giant radio interferometers depend on state-of-the-art, high- speed computers to combine signal ...
CHAPTER 6 | LIGHT AND TELESCOPES 117 unhindered, giving radio astronomers an unobscured view. (Th e same is also true, to a larg ...
118 PART 1^ |^ EXPLORING THE SKY sunscreen. In fact, it could not observe from Earth orbit because Earth is such a strong source ...
CHAPTER 6 | LIGHT AND TELESCOPES 119 satellite was launched in 2002 and has been very productive in the study of violent eruptio ...
120 PART 1^ |^ EXPLORING THE SKY Such thin mirrors weigh less, are easier to support, and cool faster at nightfall. ▶ High-speed ...
CHAPTER 6 | LIGHT AND TELESCOPES 121 Small telescopes are often advertised as “200 power” or “magnifi es 200 times.” As someone ...
122 Clouds of gas 170,000 light-years away glow in this false-color image. Red represents sulfur atoms, green hydrogen, and blue ...
CHAPTER 7 | ATOMS AND STARLIGHT 123 sun’s atmosphere, and found that the spectra of other stars have similar patterns of lines, ...
124 PART 2^ |^ THE STARS a comb through your hair creates a static charge by removing a few electrons from their atoms. An atom ...
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