Kashlinsky and colleagues first noticed the dark flow when studying the way gas in galaxy clusters interacts with the cosmic microwave background radiation.
卡什林斯基和同事们是在研究星系团气体与宇宙微波背景辐射之间相互作用时首次注意到黑暗流的。
2
Usually, gas clouds in space have been warmed to at least 2.7 kelvin by the cosmic microwave background, the relic radiation left over from the big bang.
通常太空中的气体云在大爆炸所遗留下的宇宙微波的背景的作用下至少要加热到2.7开尔文。
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The telescopes sift through the background cosmic radiation to find spots where it has been slightly perturbed as it passes through extremely hot gas, a hallmark characteristic of galaxy clusters.