PG2 - Building a Planet

PG2 - Building a Planet - Sound has a pitch Pitch depends...

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9/8/11 1 Sound has a pitch Pitch depends on frequency - the number of waves that pass a point in a given period of time Doppler effect
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9/8/11 2 Color of light is measured by frequency High Frequency Low Frequency
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9/8/11 3
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9/8/11 4 Some data to explain: 1. Planets isolated 2. Orbits ~circular / in ~same plane 3. Planets (and moons) travel along orbits in same direction… same direction as Sun rotates Nebular Hypothesis Molecular cloud
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9/8/11 5 Nebular hypothesis The ball at the center grows dense and hot enough for fusion reactions to begin. It becomes the Sun. Dust (solid particles) condenses in the rings. Dust particles collide and stick together, forming planetesimals.
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9/8/11 6 original artwork by Gary Hincks Gravity reshapes the proto-Earth into a sphere. The interior of the Earth separates into a core and mantle. Forming the planets from planetesimals: Planetesimals grow by continuous collisions. Gradually, an irregularly shaped proto-Earth develops. The interior heats up and becomes soft. Attendance: A. Please click A B. Please click A C. Please click A D. Please click A
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9/8/11 7 What is the probable origin of the sun: A. it formed from the explosion of a star B. it formed from sudden heating of the solar system C. it formed from the inward collapse of a molecular cloud D. it formed during the Big Bang Relative Abundance of Elements
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9/8/11 8 Moon formation Impacter Earth Moon rocks 4.47 billion years old support this impact hypothesis.
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