Original: 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 2 million years before the chondrules formed.
Simplified: 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 2 million years before the chondrules formed.