尽量有翻译.字数在200个单词.

Our Place In Space
There are approximately four hundred million galaxies in the universe. We can see only a small part of our galaxy.This is the Milky Way.
There are over three billion stars in the Milky Way.The sun is one of the stars.There are nine planets around the sun.
The Earth is the third planet from the sun.The Earth has one natural satellite--moon.The moon is only a quarter of the size of the Earth.