Monday, 11 February 2013

Formation of the solar system

The solar system was formed only 4.5 billion years ago.  This compared with the 13-14 billion year history of the Universe.  So in overall terms, the solar system is a bit young.  The force that created our solar system was an explosion from another large star in our galaxy going supernova.  When it did so, it compressed a cloud of gas and resulted in ...... well everything in our world for starters.



What are the stages?


  1. The blast wave compresses the gas and dust cloud.  It now begins to be attracted to other molecules by the force of gravity.
  2. The debris begins to compress and spin.  Over time it forms a disk.
  3. Larger particles begin to collide with other particles.  They fuse together forming even bigger ones.  As they grow, the gravitational attractive force that they exert begins to increase.
  4. Eventually all the debris in a path is swept up leaving a single large body called a planet.



What evidence supports this theory?

  1. The chemicals that make up the solar system are all the same age.
  2. The planets of the solar system all rotate on the same orbital plane.

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