1. How does the mass of planets cause gravity? 2. How does gravity cause orbit? 3. Are there other factors contributing to gravity than just mass? 4. Are there some planets or areas without gravity?
Stephen - Take a look at the article on "Gravitation" on World Book Student. The article may answer some of your questions, and it may also generate more questions.
Stephen - Take a look at the article on "Gravitation" on World Book Student. The article may answer some of your questions, and it may also generate more questions.
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