Here's how the answers fit into your statements:
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The sun-centered system of planets developed by Copernicus is an example of a heliocentric model.
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Kepler discovered that the orbit of each planet is an ellipse, rather than a perfect circle.
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An Earth-centered system of planets is known as a(n) geocentric model.
So, the completed statements read:
- The sun-centered system of planets developed by Copernicus is an example of a heliocentric model.
- Kepler discovered that the orbit of each planet is an ellipse, rather than a perfect circle.
- An Earth-centered system of planets is known as a(n) geocentric model.