Polarized emission has been detected from the largest Lyman-α gas cloud, known as blob 1. This result strongly suggests that such clouds are powered by a central source of ionizing radiation. See Letter p.304
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Bower, R. Unlocking the secrets of the giant blobs. Nature 476, 288–289 (2011). https://doi.org/10.1038/476288a
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DOI: https://doi.org/10.1038/476288a
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