Chapter 6: Problem 28
Why must astronomers use satellites and Earth-orbiting observatories to study the heavens at X-ray and gamma-ray wavelengths?
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Chapter 6: Problem 28
Why must astronomers use satellites and Earth-orbiting observatories to study the heavens at X-ray and gamma-ray wavelengths?
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No major observatory has a Newtonian reflector as its primary instrument, whereas Newtonian reflectors are extremely popular among amateur astronomers. Explain why this is so.
Why can radio astronomers make observations at any time during the day, whereas optical astronomers are mostly limited to observing at night? (Hint: Does your radio work any better or worse in the daytime than at night?)
How are the images made by an X-ray telescope different from those made by a medical X-ray machine?
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 is spherical aberration? How can it be corrected?
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