Why do you think people had a hard time accepting the idea of gravity as a force that keeps planets in their orbits?

30 points - when can a theory be modified if a new type of technology allows for new observations that raise new questions? a. immediately, while the questions about the theory are being asked b. after new hypotheses related to the theory are tested in experiments c. only after the new observations disprove all parts of the theory d. while scientists begin to think about how the theory could improve

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If two parallel light rays hit a mirror, they will not be parallel to each other after they reflect.