Bell Work. Why are solar eclipses so rare? What are scale models?
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1 Daily Routine Sit in your appropriate seat quietly All back packs on the floor All cell phones away All IPods off and headphones out of your ears Have all necessary materials out No food or drink except for water
2 Bell Work Why are solar eclipses so rare? What are scale models?
3 No Homework Announcements
4 Modeling the Solar System The Solar System: Is Pluto a planet or a dwarf planet?
5 Today we will Create a scale model of the solar system
6 Spend 10 minutes finishing yesterday s scale calculations
7 Scale Model of the Solar System Lab
8 Daily Routine Sit in your appropriate seat quietly All back packs on the floor All cell phones away All IPods off and headphones out of your ears Have all necessary materials out No food or drink except for water
9 Bell Work What are neap and spring tides? What does the scale 1 cm = 100 km actually mean?
10 No Homework Announcements
11 Modeling the Solar System The Solar System: Is Pluto a planet or a dwarf planet?
12 Today we will Create a scale model of the solar system
13 Get into your groups from yesterday and finish yesterday s scale model.
14 Daily Routine Sit in your appropriate seat quietly All back packs on the floor All cell phones away All IPods off and headphones out of your ears Have all necessary materials out No food or drink except for water
15 Bell Work Why does the moon go through different phases? Why don t we see the far side of the moon?
16 No Homework Announcements
17 Modeling the Solar System The Solar System: Is Pluto a planet or a dwarf planet?
18 Today we will Create a scale model of the solar system
19 Formation of the Solar System Nebular Model A nebula is molecular cloud made up of gas, ice and dust particles These nebular clouds are the birthplace of stars and planets Scientists believe that the sun and solar system formed out of a nebula about 4.6 billion years ago 11/15/99 Norm Herr (sample file)
20 Making the Solar System: It s Like Making Pizza! 11/15/99 Norm Herr (sample file)
21 Solar System Formation Step 1: Gravitational Collapse Shock waves from a nearby exploding star cause the Nebula slowly shrink or collapse As more material collapses, the stronger the gravitational pull inward is
22 Solar System Formation Step 2: Angular Momentum As it collapses, or shrinks it spins faster into a disk shape due to angular momentum A center bulge develops at the center of the spinning disk This explain why the planets orbit in the same direction
23 Solar System Formation Step 3: Condensation Condensation causes gas particle to become solid dust particles These particles start to stick together like dust bunny s on the top of your TV
24 Rocky Planets vs. Gassy Planets Hot Inner Disk: Rocky planets formed in the inner solar nebula disk because only rocky material (iron, silica) could condense and solidify Icy Particles Cold Outer Disk: Gassy planets formed in the outer solar nebula disk where it was cooler and gases (hydrogen, helium) could condense Rocky particles
25 Solar System Formation Step 4: Accretion Accretion occurs as solid particles stick together becoming larger in size The inner planets form as rocky material begins to clump together Rocks collide to make boulders, boulders collide to make small planets (planetesimals) The outer planets from as icy material clumps together
26 Solar System Formation Step 5: Bombardment The newly formed planets now have enough gravity to pull in the remaining debris in the solar system As a result, planets are being bombarded by asteroids and small planets
What is it like? When did it form? How did it form. The Solar System. Fall, 2005 Astronomy 110 1
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