Physics 20A: Introduction to Astronomy Homework assignment #2 Due October 8 1. Can X-rays from astronomical objects be observed from telescopes on the ground? Explain why or why not. What about radio waves? 2. Explain how it might be possible to observe both emission lines and absorption lines from the same nebula. Describe the two separate observations that you would have to do. 3. Does the Doppler effect for starlight depend on the distance from us to the star? 4. Describe the advantages of reflecting telescopes relative to refracting telescopes. Why is it that until about 100 years ago, most research telescopes were refracting telescopes? 5. Describe the various factors that result in blurring of astronomical images. Which of these factors can be overcome or alleviated, and how? 6. Given that the Hubble space telescope is such a powerful instrument, why is it still important for as-tronomers to use telescopes on the ground? 7. The Shane Telescope at Lick Observatory has a 3-meter diameter mirror. How many times more powerful
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