Galileo's observations of the gibbous phase of Venus proved
A) that Venus orbits the sun.
B) that Earth orbits the sun.
C) that all of the planets orbit the sun.
D) that the moon orbits Earth.
E) that Venus has an atmosphere.

Question

Quizplus · Accepted Answer

Galileo's observation of the gibbous phase of Venus demonstrated that Venus must orbit the sun, as this phase could only occur if Venus was illuminated by the sun from different angles, consistent with a heliocentric model.

Galileo's Observations of the Gibbous Phase of Venus Proved