1. Earth and Other Planets Chapter 16 Great Idea: Earth, one of the planets that orbit the Sun, formed 4.5 billion years ago from a great cloud of dust.

2. Chapter Outline The Formation of the Solar System Exploring the Solar System

3. The Formation of the Solar System

4. Clues to the Origin of the Solar System Solar system –Objects gravitationally bound to Sun Deduction of origin –Observations Earth Space

5. Clue #1: Planetary Orbits Features of solar system –All planets orbit in same direction –Orbits in same plane –Most rotate in direction of orbit

6. Clue #2: Distribution of Mass Most material within Sun Two types of planets –Terrestrial planets –Jovian planets Other objects –Moons, asteroids, comets

7. The Nebular Hypothesis Nebular Hypothesis –Cloud of dust and gas –99% H and He Collapse of nebula –Planetary orbits –Clumping of matter –Planetesimals –Temperature

9. The surface of Venus is shrouded in clouds, but the Magellan spacecraft produced radar images of the surface. In this computer-generated view of a Venusian volcano, the vertical relief has been greatly exaggerated.

10. The Formation of Earth Planetesimals –Combined to form earth Great bombardment –Meteors –Growth of planet 20 metric tons per day

11. Differentiation –Heat from collisions –Dense material sank to center –Lighter material rose to surface Structure –Core –Mantle –Crust

12. Researchers attain high pressures, equivalent to those deep inside the Earth and other planets, using the diamond anvil cell. Looking through such diamond cells you can observe pressurized samples such as this high- pressure ice crystal that was formed at room temperature by squeezing water.

13. The temperature of the atmosphere is a complicated function of altitude. Earth’s Atmosphere

14. Our Atmosphere 50% below 3.5 miles 90% below 10 miles 99% below 20 miles ozone hole global warming

15. The concentration of which gas is increasing in our atmosphere leading to global warming? a)water b)acetone c)carbon dioxide d)carbon monoxide e)tri-carbon A Clicker Question.

16. Ozone absorbs photons with a wavelength between 240 and 310 nm. Most of the ozone is present in the stratosphere Between 30 and 90 km photodissociation of oxygen is possible: O 2 (g) + h  2O(g) Ozone and the Upper Atmosphere

18. The oxygen atoms can collide with oxygen molecules to form ozone: O(g) + O 2 (g)  O 3 (g) Ozone and the Upper Atmosphere

19. Depletion of the Ozone Layer In 1974 Rowland and Molina showed that chlorine from chlorofluorocarbons (CFCs) deplete the ozone layer by catalyzing the formation of ClO and O 2. Ozone and the Upper Atmosphere

20. The Formation of the Moon Big Splash –Large object impacted earth –Parts of mantle blown into orbit –Moon formed from this material

21. Planetary Idiosyncracies Cratering –Mercury, Mars, Moon –None on earth weathering Rotation –Venus –Earth’s axis –Uranus

22. The Evolution of Planetary Atmospheres Earth’s atmosphere –Early –Outgassing Atmosphere was N 2, CO 2, H 2, & H 2 O –Gravitational escape –Living organisms

23. Exploring the Solar System

24. The Inner Solar System Mercury, Venus, Mars –Mercury and Venus too hot for life Mars Exploration –Multiple missions –Found evidence of water

25. The Outer Solar System Jupiter, Saturn, Uranus, Neptune –Layered structure –No solid surface Jupiter –Comet Shoemaker-Levy –Galileo spacecraft Saturn –Cassini spacecraft

26. Moons and Rings of the Outer Planets Moons –Io –Europa –Titan Rings –Ice and rock

27. Pluto –Outermost planet –.3% of earth’s mass –Three moons –Formation Captured comet or asteroid Still open to question

28. A Tenth Planet? Xena –Orbits sun every 560 years –One moon –Larger than Pluto

29. Asteroids, Comets, and Meteors Asteroids –Small rocky bodies –Orbit sun –Most in belt between Mars and Jupiter Comets –Dirty snowballs Orbit outside Pluto Oort cloud Kuiper belt –Halley’s Comet –Stardust and Deep Impact missions Meteoroids, Meteors, and Meteorites –Meteor showers –Original solar system material