Stellar debris reveals galaxies' youthful tastes.
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References
Ibata, R., Irwin, M., Lewis, G., Ferguson, A. & Tanvir, N. A stream of metal-rich stars in the halo of the galaxy M31. Nature 412, 49 - 52 (2001).
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Pearson, H. Cannibalism feeds growing galaxies. Nature (2001). https://doi.org/10.1038/news010705-11
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DOI: https://doi.org/10.1038/news010705-11