Venus had long been known to remain within 47 degrees of the Sun when Galileo ob

Question

Venus had long been known to remain within 47 degrees of the Sun when Galileo observed the planet with his telescope. Which of the following arguments is valid?

A. If Galileo saw that Venus had only crescent phases, then it must always lie beyond the Sun.

B. If Galileo saw that Venus had a full cycle of phases, then it must orbit the Sun.

C. The phases of Venus cannot tell us anything about the relative distances of Venus and the Sun.

D. If Galileo saw that Venus is always full, then it remains between the Earth and Sun at all times.

E. If Galileo saw that Venus has only crescent phases, then it must orbit the Sun.

Explanation / Answer

Ans.B. B. If Galileo saw that Venus had a full cycle of phases, then it must orbit the Sun.

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