Gravity is the centripetal force that keeps planets in orbit
1) Gravity is the force of attraction between masses- the LARGER the mass, the GREATER the force
2) This gravitational force can act as the centripetal force that keeps one object moving in an ORBIT.
3) An orbit is possible when the forward motion of the object is equal to the force pulling it inwards
4) These orbits are elongated circles (ELLIPTICAL) with the Sun at the focus
5) The further away a planet is from the sun, the longer the orbit takes
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