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Assessment

What is the primary force responsible for keeping planets in orbit around the sun?

GravityElectromagnetic forceFrictionMagnetism

Which law describes the relationship between the distance of a planet from the sun and its orbital period?

Kepler's First LawNewton's Second LawKepler's Third LawNewton's Law of Universal Gravitation

What shape do the orbits of planets around the sun typically have?

CircularEllipticalSpiralRandom