The Ptolemic system was the first comprehensive heliocentric model.
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Q3: An astronomical unit (AU)is the distance between
Q4: Eratosthenes' value of Earth's circumference is remarkably
Q5: Occam's razor is the idea that the
Q6: Kepler's laws describe planetary orbits,but they can
Q7: Planets do not fall into the Sun
Q9: The word "planet" is derived from a
Q10: The average distance between Earth and the
Q11: The force of gravity between two objects
Q12: Earth pulls harder on the Moon than
Q13: The farther a moon is from Jupiter,the
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