Our Solar System .
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Transcript of Our Solar System .
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Our Solar System
http://www.youtube.com/watch?v=pUZ2tfr1bsU
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Essential Question
• Why is the solar system arranged the way it is?• Why are the planets, asteroids, Kuiper ice
objects.
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Nebula)
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Demo:
1. Obtain a water bottle with a cap. Fill it 2/3rds full of water.
2. Pour several pebbles and large gravel pieces into the bottle.3. Obtain a ¼ of a piece of Alka-Seltzer. Quickly place it in the bottle and
put the cap on tight.4. Gently shake the bottle for several seconds then place it upright on the table.
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Nebular Hypothesis of the Origin of the Solar System
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Step 1. About 5 billion years agoNebulae of gas (hydrogen and helium) and dust a light year across.Due to a nearby supernova explosion (?) it begins to contract As it contracts, it spins faster.Flattens into a disk shape
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Step 2:The center contracts and heats up forming a proto-star. The Sun (99% of the mass) formed at the centerSorting: Heavier material (rock an metal) gravitate toward the center.Lighter gas and dust get blown farther out
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Step 3:
Repeated collisions caused the smaller pieces of solid material to collide and condense (combine) to form larger, rocky inner planets and asteroid belt .
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Step 4:Within a few million years these bodies cooled, cleared their neighborhood and formed into the icy gassy outer planets, etc.
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Exit Slip
1. How are the planets in the solar system sorted?
2. Which planets are more dense?
define density:
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Earth’s Early History• Bombardment by high velocity meteorites
and comets• generated immense amounts of heat energy
and melted the metals and rock on the young planet.
• The denser materials like iron (Fe) sank into the core of the Earth. • lighter silicates (Si), oxygen (O)
compounds, rise near the surface. • decay of radioactive elements in the Earth, generate heat