The isotopic anomalies of CAIs give valuable clues about the solar system 's formation , suggesting that the solar nebula collapsed shortly after a nearby supernova ; radiometric dating shows that the CAIs formed about NUMBER@1 million years before the chondrules formed .

The isotopic anomalies of CAIs give valuable clues about the solar system 's formation , suggesting that the solar nebula collapsed shortly after a nearby supernova . Radiometric dating shows that the CAIs formed about NUMBER@1 million years before the chondrules formed .
