The observation that old, massive galaxies have a larger fraction of low-mass stars than their younger, lower-mass counterparts adds to mounting evidence that star formation may have been different in the early Universe. See Letter p.485
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A, NASA, ESA, HUBBLE HERITAGE (STSCI/AURA)-ESA/HUBBLE COLLABORATION; B, NASA/STSCI/R. GILLILAND ET AL.
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Bastian, N. Stars throw their weight in old galaxies. Nature 484, 462–463 (2012). https://doi.org/10.1038/484462a
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DOI: https://doi.org/10.1038/484462a
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