Physics, topic 8, space physics

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  • space physics
    • life cycle of  star
      • cloud of gas and dust (nebula)
        • gravity pulls stuff together. hydrogen collide forming helium, there is lots of energy. this is a protostar
          • long stable period, main sequence star
            • small stars expand forming red giants
              • the red giant ejects dust and gas, becoming a white dwarf
                • it cools down and has no energy and becomes a black dwarf
            • large stars expand becoming a super red giant
              • they give off lots of light/energy in an explosion called a supernova
                • supernova becomes a black hole if its big enough
                • supernova throws gas and dust everywhere leaving a dense core called a neutron star
    • the solar system
      • planets: things that orbit a star
      • dwarf planets: small planets
      • moons: things that orbit planets (natural satellite)
      • artificial satellites: man made things that orbit a planet
      • orbits
        • when object is pulled around something by gravity
        • the objects are constantly accelerating towards the planet
          • instantaneous velocity is perpendicular to the acceleration so it goes in a circle
        • speed of orbit
          • smaller radius means faster speed
          • larger radius means slower speed


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