What contributions did Chinese and Islamic astronomers make during the Dark Ages in Europe?
Describe the geocentric model of the Universe.
What are the main flaws of the Ptolemaic model of the Universe?
What is the Copernican model and what is its main flaw?
What is a theory, and can a theory ever be proved true?
When and why was the Copernican model finally accepted?
What is the Copernican Principle?