Far from an austere backwater, the intergalactic medium (IGM) is turning out to be the central staging area for cosmic evolution.
星系际介质(igm)完全不是死水一潭，它正跃居宇宙演化的中心舞台。
Then, they calculated what fraction of these photons made it all the way to the intergalactic medium, which at the time was hydrogen.
然后，他们计算出这些光子中有多少一路到达星系际介质中，当时的星系际介质就是氢。
Then, they calculated what fraction of these photons made it all the way to the intergalactic medium, which at the time was hydrogen.
然后，他们计算出这些光子中有多少一路到达星系际介质中，当时的星系际介质就是氢。
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