It Was Recently Discovered That the Scorpius-Centaurus OB Association Passed

question 97

Multiple Choice

It was recently discovered that the Scorpius-Centaurus OB association passed within 150 light-years of the solar system perhaps 2 million years ago.What is the significance?

• A) A supernova eruption in the association at that time may have sent shock waves that led to the collapse of a dark dust cloud to form the solar nebular disk.
• B) A supernova eruption in the association at that time may have sent large amounts of radiation that overwhelmed the Earth's protective ozone layer and caused widespread biological extinctions.
• C) The gravitational influence of the association probably caused the migration of the giant planets in our solar system to their present locations.
• D) A supernova eruption in the association at that time may have been the source of the radioactive aluminum isotope that was once part of some meteorites, like the Allende meteorite.

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