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Astronomers know that many surveys of the universe miss a large proportion of their targets, but a new survey has found that 90 per cent of galaxies have gone undetected.
Traditional surveys use light emitted by hydrogen, known as the Lyman-alpha line, to probe the number of stars in the distant universe.
Traditional surveys use light emitted by hydrogen, known as the Lyman-alpha line, to probe the number of stars in the distant universe.