What is the force that keeps planets in orbit around the Sun?

Today's Trivia Question

 
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Today's Trivia Question:

What is the force that keeps planets in orbit around the Sun?
Electromagnetic forceGravitational forceNuclear forceCentrifugal force
 
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Who is the author of 'The Hobbit' and 'The Lord of the Rings'?

J.K. RowlingGeorge R.R. MartinJ.R.R. TolkienC.S. Lewis

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