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Key Observations. Planets all orbit the Sun in the same direction Planets all orbit close to the ecliptic plane Sun spins in same direction as the planets orbit. Key Observations. Small, rocky planets orbit close to the Sun Large, gas/liquid planets orbit far from the Sun. Terrestrial. - PowerPoint PPT Presentation
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Key Observations
• Planets all orbit the Sun in the same direction
• Planets all orbit close to the ecliptic plane
• Sun spins in same direction as the planets orbit
Key Observations
• Small, rocky planets orbit close to the Sun
• Large, gas/liquid planets orbit far from the Sun
Terrestrial Jovian
• Distance from the Sun must affect the formation of the planets
Chemistry of the Solar Neighborhood
• Big Bang only produced H, He, Li, Be• Everything else has been produced in the life cycle of
stars– we’re all star dust!
Formation of Solar System• How might the distance from the Sun affect the formation
of planets?– Temperature
• temperature drops off with distance from the Sun
Temperature Profile
Formation of Solar System• How might the distance from the Sun affect the formation
of planets?– Temperature
• temperature drops off with distance from the Sun
• temperature of a gas is a measure of its average random speed– H & He existed as gas throughout the solar nebula– close to Sun H & He moving too fast (too hot) to be captured by planets– further from Sun H & He are moving slow enough to be captured by
planets– may be another reason why the outer planets are much more massive
than the inner ones– also explains why Jovian planets are made mostly of H & He whereas
the terrestrial planets have almost no H nor He
Formation of Solar System
Orion’s Nebula
Orion’s Nebula
Orion’s Nebula
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