The astronomer who first introduced the model shown below was: 
A) Ptolemy.
B) Johannes Kepler.
C) Nicolaus Copernicus.
D) Galileo Galilei.
Correct Answer:
Verified
Q1: Which of the following was NOT a
Q2: The astronomer who made the most sophisticated
Q4: Kepler's second law is a direct manifestation
Q5: Planets in the solar system follow:
A) circular
Q6: The Copernican explanation for retrograde motion requires
Q7: Kepler's laws of planetary motion were formulated
Q8: The Copernican model required the solar system
Q9: Suppose two planets outside of Earth's orbit
Q10: In the period 500 CE to 1000
Q11: The astronomer who formulated the three general
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