Have you ever studied the sky on a clear night?

At first, it may look like it is empty. However, if you do not focus your vision on any specific point, you will gradually notice more and more things in it. You will see bright dots, some of which are larger and brighter than others. These dots are actually stars, planets, and asteroids.

In this chapter, you will learn basic astronomic terms and concepts. If this seems like a daunting task, you can begin by reading the summary before delving into the chapter itself. 

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