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NOTES: The Solar System:

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NOTES: The Solar System: Origin: the nebular theory fits most of the facts. The nebular theory: 1. The Big Bang produced lumpy clouds--COBE satellite. – PowerPoint PPT presentation

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Title: NOTES: The Solar System:


1
  • NOTES The Solar System
  • Origin the nebular theory fits most of the
    facts.
  • The nebular theory
  • 1. The Big Bang produced lumpy clouds--COBE
    satellite.
  • 2. Recycled star stuff with heavier elements
    combined with H and He gas
  • from Big Bang, and gravity pulled it
    together.
  • There were two supernova in our region.
  • 3. The gas cloud collapsed to a spinning disk and
    a globe in the center.
  • 4. It heated as it collapsed, the center hotter
    than outer regions
  • Helmholtz contraction or heating.
  • 5. The sun's magnetic field slowed its rotation
    by dragging on
  • electrons.
  • 6. There were swirls formed to predate satellite
    systems.
  • 7. The inner regions were too hot to allow light
    gases to collect.
  • This left heavier elements and produced
    terrestrial planets.
  • The outer regions were cool enough to allow large
    amounts of H and He
  • to collect into the Jovian Planets.
  • Dust collected into planetesimals, planetesimals
    into protoplanets.

2
Steps in how the solar nebula forms.
3
The Nebular Hypothesis
4
Conservation of Angular Momentum Contraction ?
increase in rotation, shown in reverse above.
5
Hannes Alfven explained why the sun seemed to
rotate slower than conservation of angular
momentum would suggest
6
If you spin underwater with your arms out, it
slows you down. The magnetic field in the solar
nebula disk is like the arms, the charged
particles in that disk are like the water.
7
The Solar Nebula heated as it collapsed, the
center hotter than outer regions Helmholtz
contraction or heating. Compressing a gas makes
it hotter, as particles move faster.
8
Gravitational potential energy between dust
particles and gas becomes kinetic energy of
motion or heat.
9
The inner regions were too hot to allow light
gases to collect. This left heavier
elements and produced terrestrial planets.
10
Planetesimals (rocks) formed out of the dust by
gravity.
11
Planetesimals condensed into planets, moons, and
asteroids.
12
Protoplanet model by Pawel Artymowicz of Sweden
13
Prograde vs Retrograde Rotation Only Venus,
Uranus spin retrograde --opposite to earth.
14
Velikovsky in 1950s suggested Venus was hit by
something big, flipping her rotation.
He was labeled a crackpot.
15
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16
Radar Ranging bounce radio waves off planetary
body. Distance speed of light x time
17
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18
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