Passage Summary: Two individuals debate whether to give up on Einstein's theory because the amount of matter we can actually see in the galaxy is much less than what the theory says should exist.

Conclusion: Klein argues that Einstein's theory should be discarded, while Brown contends it should be maintained.

Reasoning: Klein points to a discrepancy between observed matter and theoretical predictions as evidence for abandonment; Brown cites the theory's historical success as a reason to assume the matter simply hasn't been detected yet.

Analysis: This is a Point at Issue question where the disagreement centers on the appropriate response to conflicting data. Klein views the missing matter as a 'good reason for abandoning' the theory, whereas Brown views the theory's 'great successes' as a reason to keep it and look for missing matter instead. To find the correct answer, look for a statement that one speaker would agree with and the other would explicitly disagree with. The core conflict is whether the current evidence warrants the rejection of Einstein's view.