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It has been hypothesized that our solar system was formed from a cloud

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It has been hypothesized that our solar system was formed from a cloud [#permalink]

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It has been hypothesized that our solar system was formed from a cloud of gas and dust produced by a supernova- an especially powerful explosion of a star. Supernovas produce the isotope iron-60, so if this hypothesis were correct, then iron-60 would have been present in the early history of the solar system. But researchers have found no iron-60 in meteorites that formed early in the solar system's history, thereby disproving the hypothesis.

Which one of the following is an assumption required by the argument?

(A) If a meteorite is formed early in the solar system's history, it contains chemical elements that are unlikely to be found in gas and dust produced by a supernova.
(B) Other solar systems are not formed from clouds of gas and dust produced by supennovas.
(C) Supernovas do not produce significant quantities of any form of iron other than iron-60.
(D) Researchers have found iron-60 in meteorites that were fanned relatively late in the solar system's history.
(E) If there had been iron-60 present in the early history of the solar system, it would be found in meteorites formed early in the solar system's history.

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[Reveal] Spoiler: OA

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Last edited by Akela on 23 Dec 2017, 12:12, edited 2 times in total.

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Re: It has been hypothesized that our solar system was formed from a cloud [#permalink]

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New post 23 Dec 2017, 09:05
Hypothesis: Supernovas produce the isotope iron-60.

If this hypothesis were correct, then iron-60 would have been present in the early history of the solar system.
But researchers have found no iron-60 in meteorites that formed early in the solar system's history and disproved the hypothesis.

Unstated assumption by researchers: If there was iron-60 present in the early days, it did not disintegrate over time.

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Kudos [?]: 232 [0], given: 84

Re: It has been hypothesized that our solar system was formed from a cloud   [#permalink] 23 Dec 2017, 09:05
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It has been hypothesized that our solar system was formed from a cloud

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