# Exit : Why is a light year called a light year?

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Exit : Why is a light year called a light year?
125 126 Light Years Light Years 12/16/2014 12/16/2014 Application: 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? Starter: Describe what the following terms measure: Mph, knots, mach, light yr., warp Practice Objects Lengths Pencil Book Desk Desk to wall Which units are best to describe the distances of objects to the wall? What unit would you not use to describe far distances? Why?

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

1. Starter 2. Notes 3. Connection 4. Exit December 16, 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.

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

11/ Quiz and Writing 11/ CBA Review 11/ Solar System 11/ Solar System Web 11/ Solar System Writing and Quiz 11/20-12/1 Solar System Web 12/ Planetary Soda Pop Lab 12/ Conditions for Life 12/ Space Mission Notes 12/ Solar System II with Writing 12/ Space Exploration 12/ Space Mission Poster 12/ Early Astronomers 12/ Light Years

II. Practice 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. Length of a book Length of pencil 3. Length of desk 4. Length of your desk to a wall.

III. Application 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?

Exit : Why is a light year called a light year?
177 178 Light Years Light Years 2/18/2014 2/18/2014 Application: 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? Starter: Describe what the following terms measure: Mph, knots, mach, light yr., warp Practice Objects Lengths Pencil Book Desk Desk to wall Which units are best to describe the distances of objects to the wall? What unit would you not use to describe far distances? Why?

IV. Connection Notes go here!!!

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

Exit : Why is a light year called a light year?
125 126 Light Years Light Years 12/16/2014 12/16/2014 Application: 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? Starter: Describe what the following terms measure: Mph, knots, mach, light yr., warp Practice Objects Lengths Pencil Book Desk Desk to wall Which units are best to describe the distances of objects to the wall? What unit would you not use to describe far distances? Why?

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