Formation of the solar system may have been triggered by a stellar wind. From then on, the solar system would have followed a conventional evolutionary path, including the formation of a disk and bipolar jets. The new extinct short-lived radionuclides beryllim-10 and, possibly, manganese-53 that were present in meteorites probably resulted form energetic particle irradiation within the solar system. Calcium-alumi- num-rich inclusions (the oldest known solar system solids) and chondurles could have been produced by the bipolar jets, but it is more likely that they formed during localized events in the asteroid belt.
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