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Chinese scientists say the Five-hundred-meter Aperture Spherical Radio Telescope, also known as FAST,
中国科学家表示，五百米口径球面射电望远镜“中国天眼”（FAST）
discovered the largest atomic cloud in the universe by far, which is 20 times larger than our Milky Way galaxy.
发现了迄今为止宇宙中最大的原子气体结构，尺度比银河系大20倍。
The international journal Nature yesterday published the findings.
这一成果于昨天在国际学术期刊《自然》杂志上发表。
An international team led by Chinese scientists observed a group of galaxies known as Stephan's Quintet.
由中国科学家领导的国际团队观测了一组被称为“斯蒂芬五重”的星系群。
They found a mammoth low-density gaseous structure existed in a relatively far location from the center of the Stephan's Quintet.
他们在离“斯蒂芬五重”星系群中心相对较远的位置，发现了一个大尺度的低密度气体结构。
The atomic cloud is roughly 2 million light years wide and made up of hydrogen atoms.
该原子气体结构由氢原子组成，约有200万光年宽。
The scientists suggested there might be more large-scale, low-density atomic gas structures in space.
科学家们表示，太空中可能存在更大规模、低密度的原子气体结构。
The discovery challenges the current understanding of how the galaxies and the gaseous structure evolved in the universe.
这一发现对研究星系及其气体在宇宙中的演化提出了挑战。
