Geography 2090A/B Lecture Notes - Lecture 8: Orion Nebula, Formation And Evolution Of The Solar System, Astronomical Unit
5 Jun 2016
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Document Summary
Lecture formation and physics of the solar system. 1 au astronomical unit = 150m km: distance from the earth to the sun, how we decided to measure the universe and its distances in our solar system. Light years: distance it takes light to travel in a year, 60k aus. Orion nebula: many light years across, etc, clusters of gas and dust, coming together to make stars ( star nurseries , 4. 6 billion years ago. A giant gas and dust clouds forms in the orion nebula of the milky way. Hundreds of light years across the cloud begins to collapse under its own gravity, pockets of future stars begin to form in clusters and separate. 50k years after collapse circular motion begins to dominate the sub- cloud that will. A proto star begins to form at the centre of the spinning disk of gas and grows by pulling in nearby material.
