1. Which units are best to describe the distances of objects to the wall? What unit would you not use to describe far distances? Why? Practice: Describe what the following terms measure: Mph, knots, mach, light yr., warp 12/15/2015 121 122 12/15/2015 What measurement unit would be used to measure from your desk to your home? What measurement could be used to measure from your desk to the next city? To the moon? What type of unit would we need for distances across space? Connection: Notes Exit : Why is a light year called a light year? Light Years Application: ObjectsLengths Pencil Book Desk Desk to wall EQ: How can patterns be used to describe the universe? Starter: Early Astronomer Match

2. Describe what the following terms measure: Mph, knots, mach, light yr., warp TOC: Light Years I. Practice

3. December 15, 2015 AGENDA Objective 8.8 D Model and describe how light years are used to measure distances and sizes in the universe by reading and writing while completing notes and a measurement activity. 1. Starter 2. Notes 3. Connection 4. Exit

4. Describe what the following terms measure: I. Practice Mph Speed showing the miles an object travels in a hour KnotsSpeed a boat travels Light yearDistance travels in a year warp Speed that spacecraft travels Mach Speed a plane travels when it breaks the sound barrier

5. Date Lecture/ Activity/ Lab Page 11/16 Solar System 99-100 11/17-19 Solar System Web 101-102 11/30 Planetary Soda Pop 103-104 12/1 Conditions for Life 105-106 12/2 Space Mission Notes 107-108 12/3 Lost on the Moon 109-110 12/4 Solar System with Writing 111-112 12/7 Cosmic Quest 113-114 12/8-9 Space Mission Poster 115-116 12/10-11 Travel Brochure 117-118 12/14 Early Astronomers 119-120 12/15 Light Years 121-122 Table of Contents 12/16 Light Years 125-126

6. Create a data table for the following data. With your table partner, measure the distance from each of the following. Using a pencil, 12-in ruler, and a meter stick. Be sure to label the units involved. 1.Length of a book 2.Length of pencil 3. Length of desk 4. Length of your desk to a wall. II. Practice

7. Which units are best to describe the distances of objects to the teacher’s desk? Which unit was not appropriate for describing the farthest distance? Why? What measurement unit would be used to measure from the teacher’s desk to your home? What measurement could be used to measure from the teacher’s desk to the next city? To the moon? What type of unit would we need for distances across space? III. Application

8. Which units are best to describe the distances of objects to the wall? What unit would you not use to describe far distances? Why? Practice: Describe what the following terms measure: Mph, knots, mach, light yr., warp 12/15/2015 121 122 12/15/2015 What measurement unit would be used to measure from your desk to your home? What measurement could be used to measure from your desk to the next city? To the moon? What type of unit would we need for distances across space? Connection: Notes Exit : Why is a light year called a light year? Light Years Application: ObjectsLengths Pencil Book Desk Desk to wall EQ: How can patterns be used to describe the universe? Starter: Early Astronomer Match

9. Notes go here!!! IV. Connection

10. Light Year The term light year is confusing for many people because it actually measures distance instead of time. One light year is the distance that light can travel in one year. Light travels at 186,000 miles per second; therefore, a light year is 6,000,000,000,000 miles

11. Light Year Age Using a light year as a distance measurement helps determine age. The light from a star that is 1 million light years away has traveled at the speed of light to reach us. The light we are seeing was created 1 million years ago. So the star we are seeing is really how the star looked a million years ago, not how it looks today.

12. Distance From Earth the Moon from the Earth? 1.3 light seconds. the Earth from the Sun? 500 light seconds or 8 light minutes. The nearest star? Alpha Centauri at 4.3 light years. the nearest galaxy? The large spiral Andromeda galaxy is about 2.7 million light years away.

13. How Long does it take to fly to Alpha Centauri? Speed of light : 186,000 miles per second Nearest star after the Sun: Alpha Centauri at 4.3 light years. One light year= 6,000,000,000 (6 trillion miles) Method of travel: X-15 (travels at one mile per second) 11.5 days to travel one million miles. 31.7 years to travel one billion miles. 760,000 years to reach Alpha Centauri.

14. Which units are best to describe the distances of objects to the wall? What unit would you not use to describe far distances? Why? Practice: Describe what the following terms measure: Mph, knots, mach, light yr., warp 12/15/2015 121 122 12/15/2015 What measurement unit would be used to measure from your desk to your home? What measurement could be used to measure from your desk to the next city? To the moon? What type of unit would we need for distances across space? Connection: Notes Exit : Why is a light year called a light year? Light Years Application: ObjectsLengths Pencil Book Desk Desk to wall EQ: How can patterns be used to describe the universe? Starter: Early Astronomer Match