claiming Earth is in orbit about the Sun. inventing, then improving, the telescope. writing the theory of the infinite universe. showing planetary orbits are elliptical.
I gave my students this multiple choice question: Copernicus changed the way people viewed the solar system by

Only one answer is correct among these 4 choices:
- claiming Earth is in orbit about the Sun.
- inventing, then improving, the telescope.
- writing the theory of the infinite universe.
- showing planetary orbits are elliptical.

Could you tell me which one is correct?

claiming Earth is in orbit about the Sun.