Group 9 Stars
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When you look at the night sky you can see many beautiful stars. If you are out in the country or camping in the mountains or the desert away from the city lights, you may see thousands of them.You might be able to see some of the Milky Way.In a town or city, you can't see nearly as many stars because the city lights create a glow in the sky masking many of them.

There are several different kinds of stars in the sky.Some are big some small.A couple of stars have been found that are 100 to 200 times larger than the sun.
Some very old stars are smaller than the Earth. Scientists study stars and place them in groups based on how they are alike and how they are different.

Yellow Star:

Like the Sun, these medium-sized stars are yellow because they have a medium temperature.Their higher temperature causes them to burn their fuel faster.
This means they will not live as long, only about 10 billion years or so.Near the end of their lives these medium-sized stars swell up, becoming very large.
Eventually they shrink again, leaving behind most of their gas. This gas forms a beautiful cloud around the star called a Planetary Nebula.

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