Which of the following did NOT require the use of a telescope to observe?
A) spots on the Sun
B) retrograde motion of the planets
C) phases of Venus
D) Jupiter's moons

Question

Quizplus · Accepted Answer

Retrograde motion of the planets could be observed without a telescope by simply observing their position in the sky relative to the stars over time. Spots on the Sun, phases of Venus, and Jupiter's moons all require the use of a telescope for observation.

Which of the Following Did NOT Require the Use of a Telescope