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Variations in the ‘fogginess’ of the universe identify a milestone in cosmic history


Large differences in the ‘fogginess’ of the early universe were caused by islands of cold gas left behind when the universe heated up after the big bang, according to an international team of astronomers. The results, reported in the Monthly Notices of the Royal Astronomical Society, have enabled astronomers to zero in on the time when reionisation ended and the universe emerged from a cold and dark state to become what it is today: full of hot and ionised hydrogen gas permeating the space between the luminous galaxies.


Variations in the ‘fogginess’ of the universe identify a milestone in cosmic history