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1. The Earth and the Sun are made of completely different material. Which matches
the elemental abundances of the rest of the Universe?
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2. Make a sketch of the three atmospheric layers of the Sun showing the relative sizes and temperatures of the photosphere, chromosphere, and corona.
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3. What causes the limb darkening seen in the photosphere? How can this effect be used to measure the temperature gradient throughout the photosphere?
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4. Is the spectrum of the photosphere an absorption or an emission spectrum? Which type of spectrum does the chromosphere exhibit? How can this difference be used to view the chromosphere any time rather than waiting for a total solar eclipse?
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5. How can the temperature be so much higher in the corona than in the photosphere?
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6. What causes the granulation patterns seen in the photosphere?
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7. What important lessons concerning the interior of the Sun have been learned through the study of helioseismology?
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8. Why do sunspots appear so dark?
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9. Describe the changing sunspot cycle through 22 years.
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10. How may activity on the Sun affect the Earth?
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