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What did Galileo see?

Explore Galileo's groundbreaking observations of sunspots, which confirmed the Sun's rotation and shed light on its composition. Discover the role of nuclear fusion in making the Sun so hot and learn about the mesmerizing phenomenon of Aurora Borealis caused by the interaction of solar wind with the Earth's atmosphere.

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What did Galileo see?

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Presentation Transcript

  1. What did Galileo see? • He observed sunspots when he looked at the sun. • He noticed that they moved across the face of the sun confirming that the Sun rotates. • What theory does this support?

  2. What is the sun made of? • About three-fourths of the Sun's mass consists of hydrogen, most of the rest is helium. • EX: • Less than 2% consists of other elements, including iron, oxygen, carbon, neon, and others.

  3. What makes the sun so hot? • The Sun, like most stars, generates its energy by nuclear fusion of hydrogen nuclei into helium. • Nuclear fusion is a reaction in which two or more light nuclei combine to form a heavy nucleus with the liberation of large amount of energy.

  4. What are sunspots? • Sunspots: areas of gas that are cooler than the gas around them.

  5. What causes an Aurora Borealis? • Solar wind hits the Earth’s atmosphere, causing gas molecules in the atmosphere to glow. • EX:

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