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Gravity and inertia

Explanation:

  • Gravity is the force which keeps all the planets in its position. The sun has enough gravity to keep the planets in its orbit.
  • Inertia is the force that makes sure that the planets continue to be in motion.
  • Gravity and inertia work hand in hand so the planets are in their position and their speed is also maintained.
  • If these two forces do not exist, then the earth's orbit would collapse.
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Answer: 2 facts

Explanation: Newton concluded that two factors—inertia and gravity– combine to keep Earth in orbit around the sun, and the moon in orbit around Earth.

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