Lyman-α emitters are thought to be young, low-mass galaxies with ages of ~108 yr(refs 1, 2). An overdensity of them in one region of the sky (the SSA 22 field) tracesout a filamentary structure in the early Universe at a redshift of z ≈ 3.1 (equivalent to 15 per cent of the age of the Universe) and is believed to mark a forming
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