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 provided direct proof of a planet orbiting the Sun. As Venus orbits the Sun, it goes through phases similar to the Moon's phases as seen from Earth. Galileo's observation of these phases supported the Copernican model of the solar system, which placed the Sun at the center with the planets orbiting around it.

Galileo Observed All of the Following