The Milky Way Galaxy

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Chapter 8, Astronomy

Lesson 5, Galaxies and Beyond

Objectives __________________________________________________________

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Main Idea __________________________________________________________

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Vocabulary

galaxy ______________________________________________________________

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Milky Way __________________________________________________________

_______________________________________________________________ spectrum ___________________________________________________________

_______________________________________________________________ expansion redshift ____________________________________________________

_______________________________________________________________ big bang ____________________________________________________________

_______________________________________________________________ background radiation _________________________________________________

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What are galaxies?

Is a constellation a natural grouping of stars? ______________________________

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In what way are stars naturally grouped? _________________________________

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The Milky Way Galaxy

What is the name of the galaxy in which Earth is located? What type of galaxy is it? _________________________________________________________________

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How can you tell that Earth is in one of the Milky Way’s spiral arms and not in its center? _____________________________________________________________

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Quick Check

Fact and Opinion

“The Milky Way is a spiral galaxy.” Is this statement a fact or an opinion? Why? __

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Critical Thinking

How are the three types of galaxies similar? How are they different? __________

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What was the big bang?

If all of the galaxies are moving away from one another, how would their positions now compare with their positions in a hundred years? _______________________

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How would their positions a hundred years ago compare with their positions now?

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What about a thousand years ago? ______________________________________

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As you look further and further back in time, what do you see happening to the universe? ___________________________________________________________

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Can we see everything there is? _________________________________________

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Formation of the Solar System

Read a Diagram

Star Formation

How does this region of galaxy M33 resemble “starburst” galaxies? ____________

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Quick Check

Fact and Opinion

“Scientists theorize that the universe was very hot and dense in its first moments.”

Is this a fact or opinion? Why? _________________________________________

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Critical Thinking

What do astronomers think caused the background radiation found in space? ____

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How did Earth form?

Of what are the inner planets mostly made? Of what are the outer planets mostly made? _____________________________________________________________

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What keeps the rock in the planets and the gas in the Sun from flying out into space? _____________________________________________________________

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What formed the atmosphere that surrounds Earth today? ___________________

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Read a Diagram

How Our Solar System Formed

What part did gravity play in the formation of the solar system? _______________

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Quick Check

Fact and Opinion

“Plants did not exist on Earth in its first years, because the atmosphere lacked oxygen.” Is this statement a fact or an opinion? Why? ______________________

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Critical Thinking

How did Earth’s original atmosphere evolve into its present one? ______________

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