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Physics 5 – The Universe Assessment Details Scenario…… You have been employed by NASA to prepare a report into how we can continue to investigate the universe, its galaxies and stars. They would like you to talk about what has happened in the past, what we are doing now, and how we can continue to investigate in the future. 340 194 340 Btec AQA Long 2 Internet The majority of research for this assignment will require the use of the internet a. A basic description of how an optical telescope works b. Explain how astronomers know that all stars are moving away from us c. A description of the Earth’s place in the universe, this is to include solar system, galaxy and universe. d. Describe the terms: Solar system, Galaxy, universe e. Explain the difference between the Ptonomony and Kepler model of the solar system. f. Explain what the Hubble space telescope is and why it produces clearer images of the universe. g. Draw diagrams to show the light waves from a close star and a distant star and explain how redshift can be used to approximate the stars distance from us. h. Compare and contrast an earth based and space based telescope. Providing advantages and disadvantages of each. i. Explain why redshift cannot be used to determine the distance of very close stars. Ideas of the Solar System… • In 1539 it was thought that the earth was at the centre of the universe [Ptonomony] • By 1575 a Johannes Kepler worked out that the sun must be at the centre of the solar system Orbits… Demo: mass on string • All planets orbit the sun, our closest star.. • Orbit means go around… • The further a planet is from a star the slower it orbits. The time taken to orbit will also increase. • Gravity stops planets from flying off into space. Gravity holds the moon in orbit around the earth Copy, but use diagrams Gravity also holds the earth in orbit around the sun At the centre of our galaxy, there is a huge black hole. The black holes’ gravity holds the galaxy together