Galileo observed all of the following. Which observation offered direct proof of a planet orbiting the Sun?
A) Phases of Venus
B) Four moons of Jupiter
C) Patterns of shadow and sunlight near the dividing line between the light and dark portions of the Moon's face
D) The Milky Way is composed of many individual stars.

Question

Quizplus · Accepted Answer

Galileo observed the phases of Venus, which offered direct proof of a planet orbiting the Sun because these phases were only possible if Venus orbited the Sun and not the Earth.

Galileo Observed All of the Following