Geo Chp.26 Notes for Website.doc - 26.1 The Suns Size Heat...

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26.1- The Sun’s Size, Heat, and Structure (p.572-576) * The sun affects our lives in more ways than we can imagine (even though it is about 150 million km away!) : produces heat, light, energy for photosynthesis, food, wind, ocean currents, tides, radiation, weather, etc. After today’s lecture, you should be able to: -Explain the structure of the sun and its energy source . -Describe the effects of sunspots , solar wind , and magnetic storms on Earth and explain the role of Earth’s magnetic field . The Sun’s Size : Diameter = 1,400,000km (868,000miles) Diameter of Earth = 12,750km (7,920mi) More than 1 million Earth’s would fit inside the sun! The Sun’s Energy : The sun is a star , and all stars get their energy from fusion : combining the nuclei of lighter elements to form a heavier element During fusion, matter is converted into energy! (E=mc 2 ) Fusion can only take place under intense pressure and heat - so intense that the parts of an atom are torn apart (high heat) and the nuclei from different atoms are fused together (high pressure)!
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