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Scientific ideas about the solar system have changed over time. Which of them
following statements best compares older models of the solar system with the
currently accepted model?
A. In older models, Earth's distance from the sun changed, while in the current
model, Earth's distance from the sun is constant.
B. Older models showed planets moving in circular orbits, while in the current
model, planets move in elliptical orbits.
C. In older models, Venus was closest to the sun, while in the current model,
Mercury is closest to the sun.
D. Older models included ten planets, while the current model includes
eight planets
