For how long has it been known that the planet Jupiter has moons?
A) since the first spacecraft flybys by Pioneer I in 1979
B) since 1948, when the Mount Palomar telescope was completed
C) since Galileo turned his telescope toward the sky in 1610
D) since the time of the ancient Greeks

Question

Quizplus · Accepted Answer

It has been known that Jupiter has moons since Galileo Galilei first observed them in 1610 using his telescope. This discovery marked a significant moment in the history of astronomy, demonstrating that not everything orbits the Earth and providing strong support for the Copernican system, which posits that the Earth and other planets orbit the Sun.

For How Long Has It Been Known That the Planet