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Roškar added that the findings "provide a really nice explanation" for why there appears to be so much variation in the chemical composition of similarly aged stars that are close enough for us to observe and analyze.
Jerry Sellwood, an astronomer at Rutgers University in New Jersey who has studied star migration, said Roškar's results help shed light on previously puzzling aspects of our galaxy.
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"This is important work that changes some of our basic ideas about how we can understand the past history of the Milky Way from studying what we see today," said Sellwood, who was not involved with the study.
The study appears in the current issue of Astrophysical Journal Letters.
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