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Name: ___________________________ Notes – #25 Our Sun, the Nearest Star 1. The Sun is mostly __________________. The second most abundant element in the Sun is ____________________. 2. By mass, the Sun is _______% hydrogen, ______% helium and only _______% of the Sun is made up of elements heavier than helium. 3. The nuclear reactions occur in the ____________. 4. The two outer layers of the Sun’s interior are called the _________________ zone and the __________________ zone. 5. Convection is where hot gasses __________ and cooler gasses __________. 6. The “surface” of the Sun is called the ______________________. 7. The particles from the Sun escaping into space make up the ______________________. 8. The Sun’s diameter is _________ times the Earth’s diameter. 10. How many Earth’s could fit inside the Sun? _______________________ 11. The dark spots on the Sun are called ____________________. 12. The sunspots appear black or grey because they are ______________ in temperature. They are about ________________ degrees cooler than the surrounding material. 13. Sunspots are regions of strong __________________ fields. The magnetic fields inhibit energy from reaching the surface, so the sunspots are cooler. 14. The sunspot cycle lasts about ______ years. 15. The Sun’s equator rotates more ______________ than at the poles.