Passage Summary: Scientists thought a star explosion (supernova) created our solar system. Since those explosions leave behind a specific type of iron, we should see that iron in the oldest space rocks. Because we didn't find any, the scientists say the theory is wrong.

Conclusion: The theory that the solar system was created from a supernova's gas and dust is incorrect.

Reasoning: Supernovas create iron-60, which should have been present in the early solar system if the theory were true; however, no iron-60 was found in meteorites from that early period.

Analysis: The argument relies on a significant 'gap' between the evidence (no iron-60 in meteorites) and the conclusion (the hypothesis is false). For this logic to hold, the author must assume that those specific meteorites are a perfect record of the early solar system's composition. What if iron-60 was present but didn't make it into those specific rocks, or what if it decayed so quickly it's no longer detectable? The argument *needs* to assume that if iron-60 existed in the early solar system, it would definitely be found in the meteorites being studied today.