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Before Kepler accurately described planetary orbits, what mathematical shape did Copernicus still assume for the planets' paths in his heliocentric model?

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Answer Explanation

While Copernicus bravely proposed a Sun-centered model, he still adhered to the ancient Greek belief in perfect celestial spheres, thus assuming planets moved in perfect circles around the Sun. Kepler later corrected this to ellipses.

A. Parabola

21%

B. Ellipse

C. Perfect Circle

62%

D. Hyperbola

11%

Before Kepler accurately described planetary orbits, what mathematical shape did Copernicus still assume for the planets' paths in his heliocentric model?

Answer Explanation

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