Question

How has the concept of a "planet" changed since the 16th century before the invention of the telescope? Do you think this shows scientific accuracy or disproves future facts, as one assumes that they will be discredited in time too??

Answer 1

The concept of a "planet" was first thought to be those objects in space which orbit the Earth in epicycle motions. The concept has changed since the invention of the telescope since it was observed that Ptolemy's theory was incorrect. The planets do not orbit the Earth but orbit around the sun.