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6. First part of the name for the star system

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I. Second part of the name of the star system nearest to ours 3. System pertaining to the Sun M. Alpha Centauri is a star _ 5. A vehicle for traveling in spoce 8. From Pluto It would take you another.

nearest to our solar system 7. The Sun is one.

Ptanet we live on 10. Number of years It would take a spaceship to reach Ptuto thousand years to reach Alpha Centauri.

We use the words see or sees to tell about something happening now. We use saw to tell about something that already happened. Write see. sees, or saw in the sentences about stars below.

I. Last night, we_the stars.

2. John can_the stars from his window.

3. He_them every night.

4. Last week, he_the Big Dipper.

6. If you_it, you would remember itl

7. John_It often now.

How often do you it?

What Is a Galaxy?

A galaxy is a very large collection of stars, planets, moons, gas. and whatever other kinds of matter lurk in space. Galaxies come in many sizes. Small ones contain several billion stars, while the largest ones contain more than a trillion stars!

Galaxies also come in many shapes: round like a ball, oblong like a football, or flat like a pancake. Some of the flat ones have what look like huge arms spiraling outward. These are called spiral galaxies.

All galaxies spin, and the faster they spin, the flatter they are. We live In a pancake-shaped, spiral galaxy. Do you know its name?

Unscramble the letters below to discover the name of the galaxy in which we live.

Our Galaxy

Look up at the sky. During the daytime, treetops, birds, airplanes, clouds, and a blue sky seem to stretch forever. A boll of light shines too brightly to look at.

At night, you see something different—a dark sky with a moon and stars. Billions of stars shine in the far distance. Each star is a fiery ball of hot gas. All the stars you see travel together as a large group through space in one galaxy called the Milky Way. The Milky Way is one of many galaxies in space.

One star is closer to you than any other. This star shines daylight on you, provides hedt, and helps plants grow. This star is called the Sun.

Two Different Skies

I. Take two pieces of construction paper, one black and one blue. 2 Glue these papers back to back.

3. Look at the sky on a clear day and on a clear night.

4. Decorate the papers using cotton balls, cut-out construction paper, glitter, or any items that you have to make the daytime and nighttime skies you see. 5. Use string on two corners to hang your two skies from a hanger.

Day and Night

Can you name five things that make day different from night?

The Milky Way Galaxy

The Milky Way galaxy is made up of the Earth, its solar system, and all the stars you can see at night. There are over 100 billion stars in the Milky Way! The Milky Way is shaped much like a c.d. It has a center which the outer part goes around.

The Milky Way Is always spinning slowly through space. It is so large that It would take 200 million years for the galaxy to make one complete turn. Many stars In the Milky Way are in clusters. Some star clusters contain up to one million stars!

The Milky Way galaxy is made up of □ ™af system □ 100 billion stars.

Circle Yes or No:

The Milky Way is shaped like a pencil. The Milky Way is always slowly moving in space Many stars In the Milky Way are in clusters. Some star clusters have one million stars.

It would take qo million years for the galaxy to spin once. 600

Underline:

Which object is the Milky Way shaped like?

Yes

No

Yes

No

Yes

No

Yes

Our solar system Is only a tiny part of a clear night, we can see part of the the Milky Way galaxy. A galaxy is a Milky Way from Earth. It looks like a giant collection of billions of stars, long, white cloud stretched across the

Our Milky Way galaxy contains over sky. Beyond our galaxy, there are

100 billion stars including our Sun. On billions of other galaxies.

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2. This star is the center ot our solar system.

M. Earth is one of nine_that make up the Milky Way galaxy. 5. Number of galaxies in the universe 8. Earth Is part of this system. 10. A giant collection of billions of stars

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I. All of the galaxies and the space between make up the_.

6. First word in the name of our galaxy

7. _is part of the Milky Way galaxy.

Q. From Earth, the Milky Way looks like a long, white_.

The Andromeda Galaxy

The Andromeda galaxy is the closest big galaxy outside our own Milky Way. It is the most distant object in the sky that you can see without a telescope. It looks like a faint smudge of light in the northern sky. In 1123,

Edwin Hubble proved that it was at least two million light-years from Earth. It Is shaped like the Milky Way galaxy. It has "arms" made of billions of stars, which orbit around its galactic center.

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