Question

one of the first astronomers to use a telescope was galileo. using his telescope he discovered that jupiter had four moons and each night, the four moons, seen as points of light, appeared to change positions slightly. which of these was not a conclusion based on this observation? a planets other than earth have moons. b the planets vary in size and composition. c our solar system is heliocentric rather than geocentric. d in our solar system, objects can orbit various planets, not just earth.

Explanation:

Galileo's observation of Jupiter's moons showed that planets other than Earth have moons (A), and that objects can orbit planets other than Earth (D). It also supported the heliocentric model (C) as it showed that not all celestial bodies orbit Earth. However, the observation of Jupiter's moons changing positions does not give any information about the size and composition of planets.

Answer:

B. The planets vary in size and composition.