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/ /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

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

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

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

Date Lecture/ Activity/ Lab Page 11/16 Solar System /17-19 Solar System Web /30 Planetary Soda Pop /1 Conditions for Life /2 Space Mission Notes /3 Lost on the Moon /4 Solar System with Writing /7 Cosmic Quest /8-9 Space Mission Poster /10-11 Travel Brochure /14 Early Astronomers /15 Light Years Table of Contents 12/16 Light Years

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

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

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/ /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

Notes go here!!! IV. Connection

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

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.

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.

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 years to travel one billion miles. 760,000 years to reach Alpha Centauri.

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/ /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