Presented on Tuesday November 24th. This follows the textbook- Chapter 4 Section 4.3

1. Low- Mass StarsBothHigh-Mass Stars Less time in Main Sequence- use fuel quickly Main sequence into Super Giant No more fuel- super giantexplode Supernova Become either: Neutron Star Black Hole More time spent in Main Sequence-use fuel more slowly Star expands into a giant star Giant star sheds outer layers become a white dwarf Form inside a nebula Produce energy by fusion Go through Main Sequence stage

2. Galaxies have different sizes & shapes Space Science Chapter 4: Section 4.3

3. What is a Galaxy? huge grouping of stars, gas, and dust held together by gravity

4. How did the Milky Way get it’s name? because of its milky and hazy appearance

5. The Milky Way Galaxy is shaped like a disc with a huge bulge in the middle.Why do we not see the center of the galaxy from Earth? The center of the galaxy is hidden by all of the surrounding dust.

6. Review: What is a light-year? The distance it takes for light to travel in one year Which is? 6 trillion miles

7. The main bulge of the galaxy is 26,000 light years from the sun.

8. The Milky Way contains clouds of dust and gas called nebula. Review: Why are nebula important? Nebula are the birth place of stars

9. How we Classify Galaxies: Spiral Galaxy Have arms of stars and dust that curve away from the center Has a central bulge which consists mostly of old stars Spiral arms are new stars

10. Elliptical Galaxy Shaped like spheres or eggs No dust or gas between stars All stars are old

11. Irregular Galaxy Faint galaxies No definite shape Smaller than other galaxies Have fewer stars Contains mostly young stars

12. Types of Galaxies- KIM Strategy

13. Memory Clue In the last column draw a picture of the type of Galaxy Refer to page 132 if you need a reference point When finished: Get a Picture Sort Sheet from Miss. Hudak Cut and sort the pictures according to their shape Staple them to the appropriate column

14. Review http://www.brainpop.com/science/space/galaxies/