A Sense of Where We Are - Pennsylvania State University
The planets orbit Earth, which orbits the sun. 3. Who was the first person to propose a heliocentric model of the universe? a. Archimedes. b. Aristarchus. c. Ptolemy. d. Galileo. 4. After the Middle Ages, the astronomer who changed the model of the solar system by placing the sun at its center was. a. Galileo. b. ................
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