P1.1 - The Solar System

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  • P1.1 - The Solar System
    • Changing Ideas
      • Geocentric
        • 130 CE
        • Greek Astronomer Ptolemy
        • Earth-centred with other planets orbiting
      • Heliocentric
        • 1543 AD
        • Nicolaus Copernicus
        • Argued that the planets were all in orbit around the sun
        • Fitted data better - made more sense
        • Challenged religious view of the universe
    • Observing the Universe using Waves
      • Naked Eye - Visible Light
        • Some stars and planets
      • Telescopes
        • Allow us to see more distant, fainter objects
          • Large lenses and mirrors gather more light
        • Large lenses and mirrors gather more light
        • Hubble Space Telescope
      • Photographs
        • Provide a record of observations
          • Can be studied later or analysed by a computer
        • Cameras can record light arriving through a telescope over many minutes
          • Can produce pictures of objects to dim to see just by looking through a telescope
    • Galileo
      • First astronomer to make observations using telescopes
      • 1610
      • He observed four moons orbiting Jupiter
        • First objects to be seen not orbiting earth
          • Supported Copernicus
          • Meant Geocentric version was flawed as not everything orbited earth
    • Telescopes
      • Space Telescopes
        • Advantages
          • Can view earth
          • Not affected by weather
          • Does not suffer from light pollution
          • Can be used at any time
          • Can detect rays absorbed by Earth's atmosphere (no problems with atmospheric differences
            • x- rays
            • gamma rays
        • Disadvantages
          • hard to repair
          • Expensive
      • Land Telescopes
        • Advantages
          • Cheaper to build
          • Cheaper to maintain
          • Easier to maintain
        • Disadvantages
          • Atmosphere affects the view
          • Can't detect all rays
            • x-rays
            • gamma rays
          • Only work at night

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