1. Welcome to Science 12/3 Turn in HW & pick up a Ch. 19 Section 2 packet next to the tray. Read the Section Summary on Page 3 and then begin answering the questions on Page 4. Today’s Schedule 1. Science News 2. Question of the Day 3. The Sun

2. Question of the Day What object is the central figure that provides most of the energy and provides the most gravity that maintains the balance and order of the solar system to which the Earth belongs? The sun

3. What caused this?

6. What do you know about the sun?

7. The Sun: Our Very Own Star

8. The Sun 1 of billions of stars 99% of the mass of the solar system Rotates every 27 days Center of the solar system “heliocentric” 100% a giant ball of gas 330,000 times bigger than Earth 74% hydrogen, 24% helium, 2% other gasses 27 million degrees F. If you weighed 100 lbs. on Earth, you would weigh 2,800 lbs. on the sun.

9. Welcome to Science 12/6 Get out your sun packet and make sure you check the word wall for new words. Today’s Schedule 1. This week’s schedule 2. Question of the Day 3. Finish Discussion on The Sun and complete Stormy Sunspot Lab

10. Question of the Day Brought to you by: Brett Thomas In the morning the temperature of the gym was 68 F. In the evening the temperature of the gym was 78 F. Throughout the day there was a wrestling tournament in the gym. What explains the dramatic rise in temperature? Thermal Energy: As the activity and attendance in the gym increased so did the temperature.

11. I. Structure of the Sun Like Earth, the sun also has different parts. The sun is not solid. The sun is 100% gas. Like Earth, the sun has convection currents.

12. II. Energy of the Sun The sun is 4.6 billion yrs. old. How does it burn and stay so hot for so long? It is not only burning, but the sun is also shrinking due to gravity. The burning and energy created by gravity would only supply enough energy for the sun to last only 45 million years. How does the sun continue to shine?

13. II. Energy of the Sun Nuclear Power !!!!!!!!!!!!!!! The sun is also powered by nuclear fusion. Nuclear Fusion- process in which 2 or more nuclei join together (fuse) to form a massive nucleus. The result is an enormous amount of energy. Nuclear Fusion Animation Fusion in the Sun!

14. III. Activity on the Sun’s Surface Photosphere is where action takes place on the sun’s surface. Sunspots- cooler, dark spots on the sun caused by slowing convection currents

15. III. Activity on the Sun’s Surface Solar Flares- giant storms on the surface of the sun that have temps up to 5 million degrees C. Solar flares can interrupt radio signals and affect satellites in orbit. X6