星系际介质
- 网络intergalactic medium
星系际介质-
星系际介质（GM）全不是死水一潭，它正跃居宇宙演化的中心舞台。
Far from an austere backwater , the intergalactic medium ( IGM ) is turning out to be the central staging area for cosmic evolution .
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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 .