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Part 2 More fun facts about Astronomy Astronomy is the oldest science, but also the newest. On a clear night without much light pollution there about 2000 stars visible. The Cosmic View The Earth’s diameter is 8,000 miles in diameter. The Earth belongs to the solar system that has one star, our sun. The solar system is more than 9 trillion miles across. It is located in one of the spiral arms of the Milky Way. The Scale of the Solar System https://www.khanacademy.org/science/p hysics/cosmology-andastronomy/universe-scale-topic/scaleearth-galaxy-tutorial/v/scale-of-solarsystem The scale of the Galaxy https://www.khanacademy.org/science/c osmology-and-astronomy/universescale-topic/scale-earth-galaxytutorial/v/scale-of-the-galaxy The Milky Way Contains about 200 billion stars, plus gas and dust that all revolves around the center. 100,000 light years across One of billions of galaxies in the observable universe Some are 14 billion light years away. Hubble Image of galaxies https://www.khanacademy.org/science/c osmology-and-astronomy/universescale-topic/scale-earth-galaxytutorial/v/hubble-image-of-galaxies Cosmology Cosmology is the study of the origin, present structure, evolution, and destiny of the universe. Astronomers construct cosmological models, mathematical descriptions that try to explain how the universe began, how it is changing as time goes by, and what will happen to it in the future. These models must be consistent with the observational data we have on stars and galaxies. Cosmological Time Scale 1 https://www.khanacademy.org/science/c osmology-and-astronomy/universescale-topic/cosmos-time-scaletutorial/v/cosmological-time-scale-1 Cosmological Time Scale 2 https://www.khanacademy.org/science/c osmology-and-astronomy/universescale-topic/cosmos-time-scaletutorial/v/cosmological-time-scale-2 Homework What is the difference between a cosmological explanation of the universe and a religious explanation of the universe? Explain in a paragraph and towards the bottom of the page, state where you found the information.