1. Starter: What is the Herztsprung- Russell Diagram, and how is it used to classify stars? 2/22-25/2013 147 148 2/22-25/2013 Exit: Why do you think the sun is so important in our solar system? H R Diagram Application/Application: Finish HR Diagram Activity with questions Turn in when done 1/21/15 Practice: Universal address H R Diagram

2. January 21, 2015 AGENDA Objective 8.8C Describe components of the universe, including stars, nebulae, and galaxies, and use models such as the Herztsprung-Russell diagram for classification by taking notes and completing a graph. January 21, 2015 AGENDA Objective 8.8C Describe components of the universe, including stars, nebulae, and galaxies, and use models such as the Herztsprung-Russell diagram for classification by taking notes and completing a graph. 1. Starter 2. Notes 3 Activity 4. Exit

3. 12/16 Light Years 125-126 12/17 Formation of the Universe 127-128 12/18 Big Bang 129-130 12/19 Early Astronomers and Light year Writing 131-132 1/7 Waves and the EM Spectrum 133-134 1/8 Wavestown 135-136 1-9 EM Writing and Quiz 137-138 1-14 Galaxies 139-140 1-15 Counting Galaxies 141-142 1-16 Lives of Stars 143-144 1-20 Characteristics of Stars 145-146 1-21 H-R Diagram 147-148 Table of Contents

4. H-R Diagram Main-sequence Stars Main Sequence stars fall into the an area from the upper left corner to the lower right corner of the H-R diagram The hottest are blue or blue-white and are in the upper left corner of the diagram The cool, dim stars are red in the lower right corner.

5. Starter: What is the Herztsprung- Russell Diagram, and how is it used to classify stars? 2/22-25/2013 147 148 2/22-25/2013 Exit: Why do you think the sun is so important in our solar system? H R Diagram Application/Application: Finish HR Diagram Activity with questions Turn in when done 1/21/15 Practice: Universal address H R Diagram