Chapter 6: Problem 43
If you were in charge of selecting a site for a new observatory, what factors would you consider important?
Chapter 6: Problem 43
If you were in charge of selecting a site for a new observatory, what factors would you consider important?
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Get started for freeDescribe refraction and reflection. Explain how these processes enable astronomers to build telescopes.
Three of the telescopes shown in Figure 6-16-the James Clerk Maxwell Telescope (JCMT), the Caltech Submillimeter Observatory (CSO), and the Submillimeter Array (SMA)are designed to detect radiation with wavelengths close to \(1 \mathrm{~mm}\). Search for current information about JCMT, CSO, and SMA on the World Wide Web. What kinds of celestial objects emit radiation at these wavelengths? What can astronomers see using JCMT, CSO, and SMA that cannot be observed at other wavelengths? Why is it important that they be at high altitude? How large are the primary mirrors used in JCMT, CSO, and SMA? What are the differences among the three telescopes? Which can be used in the daytime? What recent discoveries have been made using JCMT, CSO, or SMA?
What kind of telescope would you use if you wanted to take a color photograph entirely free of chromatic aberration? Explain your answer.
(a) Compare the light-gathering power of the Keck I 10.0-m telescope with that of the Hubble Space Telescope (HST), which has a \(2.4-\mathrm{m}\) objective mirror. (b) What advantages does Keck I have over HST? What advantages does HST have over Keck I?
What is diffraction? Why does it limit the angular resolution of a telescope? What other physical phenomenon is often a more important restriction on angular resolution?
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