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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