Kepler's First Law, Earth follows a slightly stretched orbit., Kepler's Second Law, A planet sweeps equal areas in equal times., Kepler's Third Law, Neptune takes longer to orbit because it is farther away., Newton's Universal Gravitation, Two objects attract each other even if the force is tiny., Distance-Gravity Relation, If distance doubles, gravity becomes weaker., Mass-Gravity Relation, Jupiter pulls objects more strongly than an asteroid., Orbital Speed Principle, Mercury moves faster when it is near the Sun.

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