Non-physical Cosmology

How did Newton's discovery of gravity advance astronomy?
Answered by Discovery Channel
  • Discovery Channel

    Discovery Channel

  1. English scientist Isaac Newton discovered gravity while observing how an apple fell from a tree. He realized there must be a gravitational force pulling the apple from the tree to the ground. Likewise, he determined that the same gravitational force was holding the universe together and making the planets orbit the sun. Like his predecessor Kepler, Newton reasoned that the planets rotated in an elliptical orbit, not a circular one.

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Still Curious?
  • What did Hubble's law establish about our universe?

    Answered by Science Channel

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    Answered by Dr. Gerard van Belle

  • How did Cepheids become measuring posts?

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