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physics astrophysics (astrophysics (the solar system (the sun (clouds of…

- - - - The Sun is the only star in our solar system.
      - clouds of gas and dust
        
        The gas and dust collapsed.
        
        The cloud suddenly decreased in volume as the pressure in the cloud increased.
        
        This formed a protostar.
      - main sequence
        
        Materials continued to collide (come together) until the temperature and pressure were high enough for hydrogen nuclei to start fusing and form helium (in nuclear fusion).
        The star then went into a stable period, called a ‘main star sequence’.
      - nuclear fusion
        
        The energy released from the nuclear fusion in the Sun keeps the Sun’s core hot.
      - stable
        
        The Sun is still in its stable main sequence phase.
        In this phase, the outward force of the energy released by nuclear fusion is balanced by the force of gravity pulling the Sun inwards.
      - the sun is at the centre of the solar system. planets, moons, asteroids and comets orbit the sun
    - - Planets and dwarf planets orbit around the Sun.
        There are eight planets in our solar system (Pluto is a dwarf planet).
    - - Moons are in orbit around many of the planets.
        Moons are called natural satellites.
    - - Comets and asteroids also orbit around the Sun.
  - - - there are 8 planets in are solar system