美国科学家最近发现了宇宙中一个13.7亿光年长的银河“长城”（相较之下，我们的银河系只有10万光年），这是迄今为止所发现的最大天体结构。虽然这并不是人类在宇宙中发现的第一座“长城”，但它的长度使得既往所见6亿多光年的天体，变成黯然失色的矮子。1989年，天文学家玛格 Scientists in the United States recently discovered a 1.37 billion light-year-long galaxy “Great Wall” in the universe (compared to only 100,000 light-years in our Milky Way galaxy). This is the largest celestial structure ever discovered. Although this is not the first “Great Wall” that humans discovered in the universe, its length makes the over 600 million light-year-old objects seen in the past become eclipsed dwarfs. In 1989, astronomer Marg