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Bell Work: turn in Friday’s homework to the in box. 1. The sun is actually a ____ not a planet. 2. Why does Venus have a longer day than year? 3. Can the sun have storms? If no, why not? If yes, how? The Sun: Our Very Own Star • Good Fact for Earth: The sun is close enough to the Earth to give us light and warmth. • The sun is similar to most of the other stars in our galaxy. • It is basically a large ball of gas made mostly of hydrogen and helium held together by gravity. Energy Production in the Sun • The sun’s energy is produced by nuclear fusion. • Nuclear fusion is the process by which two or more nuclei with small masses (such as hydrogen) join together, or fuse, to form a larger, more massive nucleus (such as helium). • During the process, energy is produced- a lot of it! Activity on the Sun’s Surface • Sun Spots- Cooler, darker spots on the sun. • This is caused by magnetic fields on the sun that tend to slow down the activity in the convective zone. • Slow activity = cooler areas on the sun Activity on the Sun’s Surface • Solar Flares- giant storms on the surface of the sun. • Magnetic fields cause these disturbances in the solar atmosphere. • Solar Flares have temperatures of up to 5 million degrees Celsius.