Biology, 11.12.2019 23:31, erstaabi000

Why are planets closer to the sun made of different substances than planets farther from the sun?
- why do some planets appear to move backward in the sky?
- how do the planetary systems discovered?
- what are kepler’s laws of planetary motions?
- what are newton’s laws and how do they apply to a planetary system?
- what are some ways that the motions of the earth, moon, and sun influence each other?

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Why are planets closer to the sun made of different substances than planets farther from the sun?