Question

Fill in the blank with appropriate word to complete the sentence.
The Greek word which is the origin of the word "planets" means __________.

Answer 1

Planetai-"wanderers", from which today's word "planet" was derived. In ancient Greece, China, Babylon, and indeed all pre-modern civilizations, it was almost universally believed that Earth was the center of the universe and that all the "planets" circled Earth.

The reasons for this perception were that stars and planets appeared to revolve around Earth each day and the apparently common sense perceptions that Earth was solid and stable and that it was not moving but at rest.