Space (part 2)

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  • Space
    • Galaxies, stars and lightyears
      • Stars form spiral arms due to gravity to make galaxies
      • A lightyear is the distance light travels through a vacuum in one year
      • When  a large star uses up all its fuel and explodes, it creates a black hole
        • They have a large mass, small volume and a high density
        • They are not visible
        • Scientists use x-rays emitted from other stars as they go into black holes to observe them
    • Manned and unmanned probes
      • Manned
        • Lots of fuel would be needed
        • Needs to carry food, water and oxygen for the people
        • Can be psychologically stressful
      • Unmanned
        • Doesn't need to carry food, water or oxygen
        • Cheaper than manned
        • Maintenance can't be carried out
    • Origin of the universe
      • Red shift
        • More distant galaxies have greater red shift than nearer ones
        • This means they are moving away faster
      • Microwave radiation
        • Can be detected from all parts of the universe
        • It is known as cosmic background radiation
        • It is evidence of an initial "big bang"

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