The one significant observation Galileo made through his home-built telescope that convinced him that the planets revolved around the Sun was the
A) appearance of the Milky Way as a mass of individual stars.
B) discovery of rings around the planet Saturn.
C) appearance of mountains and craters on the Moon.
D) appearance of Venus following a cycle of phases, from crescent through quarter and gibbous phases to full.
Correct Answer:
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