1) Describe the process of hydrogen fusion. Where does the energy come from?
2) Why do astronomers say that the solar cycle is really 22 years long, even though the number of sunspots follows an 11-year cycle?
3) What is a neutrino? Why is it useful to study neutrinos coming from the Sun?
4) Does the brightness of a star change as you get closer or further away from it? What about the luminosity of the star?
5) Where did the universe’s supply of calcium, iron, oxygen, and other heavy elements necessary for life originate?

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Why do astronomers say that the solar cycle is really 22 years long, even though the number of sunspots follows an 11-year cycle?
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