PrepTest 72, Section 3, Question 4
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.
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.
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.
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?
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.
Other solar systems are not formed from clouds of gas and dust produced by supernovas.
Supernovas do not produce significant quantities of any form of iron other than iron-60.
Researchers have found iron-60 in meteorites that were formed relatively late in the solar system's history.
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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