Passage Summary: To be taken seriously, a theory has to change how we see things, but that's not the only requirement—just look at astrology, which changes our view but isn't taken seriously.

Conclusion: Affecting our perception of the world is a necessary, but not sufficient, condition for a theory to be taken seriously.

Reasoning: While serious theories must affect perception, astrology also affects perception yet is not considered a serious theory.

Analysis: The scientist mentions astrology as a counterexample to demonstrate that 'affecting perception' is not enough on its own to make a theory 'serious.' I identified this by looking at the transition 'To see this,' which signals that the example is illustrating the previous claim that the first condition is insufficient. Focus strictly on the structural role: it serves to prove that a specific condition is not a guarantee of the outcome.