People have always looked up at the sky and tried to figure out everything they could about it. Now we have tools to help us learn more (we'll learn more about these tools later). In the past, people didn't always have tools to help them figure out what was going on in the sky. They just had their eyes.
Talk about it: If you didn't know anything about the sky except what you could see, what are some explanations you might make up for why things in the sky are the way they are? For example, what was happening when the moon changed shape night by night? What made the stars twinkle? Why does the sun move like it does?
After watching for a long long time, and keeping records of what they were seeing, people started coming up with ideas about what was actually happening up there.
For example, here are some ways people thought about the earth and its shape:
http://nfo.edu/astro/models.htm
Watch this short movie, and then the long one.
For example, here are some ways people thought about the earth and its shape:
http://nfo.edu/astro/models.htm
Watch this short movie, and then the long one.
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