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Nature 457, 990-993 (19 February 2009) | doi:10.1038/nature07780;
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Massive star formation within the Leo |[lsquo]|primordial|[rsquo]| ring
Few intergalactic, plausibly primordial clouds of neutral atomic hydrogen (H|[thinsp]|i) have been found in the local Universe, suggesting that such structures have either dispersed, become ionized or produced a stellar population on gigayear timescales. The Leo ring, a massive (MH|[thinsp]|i|[thinsp]||[ap]||[thinsp]|1.8|[thinsp]||[times]||[thinsp]|109nature07780-m1jpg6273017, nature07780-m1jpg6273017 denoting the solar mass), 200-kpc-wide structure orbiting the galaxies M105 and NGC|[thinsp]|3384 with a 4-Gyr period, is a candidate primordial cloud.
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