Stars, Galaxies,and the Universe

776 Unit 6: Space Science

Our Sun is one of billions of stars in oneof billions of galaxies in the universe.

Key Concepts

The Sun is our local star.Learn how the Sun producesenergy and about the Sun’slayers and features.

Stars change over theirlife cycles.Learn how stars form and change.

Galaxies have differentsizes and shapes.Learn how galaxies are classified.

The universe is expanding.Learn about the formationand expansion of the universe.

4SECTION

3SECTION

2SECTION

1SECTION

Prepare and practice for the FCAT

• Section Reviews, pp. 783, 792, 797, 803

• Chapter Review, pp. 804–806• FCAT Practice, p. 807

CLASSZONE.COM• Florida Review: Content

Review and FCAT Practice

What could be presentin the light and darkareas in this galaxy?

Chapter 22: Stars, Galaxies, and the Universe 777

How Can Stars Differ?Look at the sky at nightand find three stars thatdiffer in appearance. Try toidentify the locations ofthese stars, using the starmaps in the Appendix atthe back of this book.

Observe and ThinkHow did the characteristicsof the stars differ?

How Do Galaxies Move Apart?Blow air into a balloon until it is partially inflated. Use afelt-tip pen to make 12 dotson the round end. Then stand in front of a mirrorand observe the dots as youcompletely inflate the balloon.

Observe and Think What caused the dots tomove apart? What might cause galaxies tomove apart in the universe?

Internet Activity: Galaxy ShapesGo to ClassZone.comto explore the differentshapes of galaxies inthe universe.

Observe and ThinkHow do the types ofgalaxies differ from one another?

NSTA scilinks.org

The Sun Code: MDL060

ClassZone.com

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778 Unit 6: Space Science

TAKING NOTES

CHOOSE YOUR OWN STRATEGY

Take notes using one ormore of the strategies fromearlier chapters—main ideaweb, combination notes,or main idea and details.Feel free to mix and match the strategies, oruse an entirely differentnote-taking strategy.

VOCABULARYSTRATEGY

Place each vocabularyterm at the center of a description wheel diagram. Write somewords describing it on the spokes.

CONCEPT REVIEW

• Electromagnetic radiation car-ries information about space.

• Our solar system is in theMilky Way galaxy.

• A galaxy is a group of millionsor billions of stars.

VOCABULARY REVIEW

solar system p. 674

galaxy p. 674

universe p. 674

electromagnetic radiation p. 679

wavelength p. 680

CHAPTER 22

outer layer ofSun’s atmosphere

extends outwardseveral million km CORONA

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shape

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density se

en

only

durin

g eclipse

Main Idea Web Combination Notes

Main Idea and Details

FLORIDA REVIEWCLASSZONE.COM

Content Review and FCAT Practice