Rocks Laid Down at Around the Time of the Permian/Triassic

question 149

Multiple Choice

Rocks laid down at around the time of the Permian/Triassic mass extinction 250 million years ago contain a surprising amount of fullerenes (football-shaped carbon molecules) .What evidence is there that the fullerenes came from outer space?

• A) The isotope ratio of carbon¹³ to carbon¹² is too great for the fullerenes to have originated on the EarthEarth.
• B) The fullerenes show evidence of having been irradiated by the solar wind for millions of years.
• C) Gases trapped inside the fullerenes could have come only from stars.
• D) The rocks in which the fullerenes are found contain decay products of short-lived radioactive aluminum isotopes that are believed to be produced only in supernovae (explosions of stars).

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