中外天文学家发现了已知最大质量黑洞。这个黑洞的质量相当于120亿个太阳,距地球128亿光年,大约在宇宙诞生10亿年后形成。相比之下,银河系中心的黑洞质量只相当于300万个太阳。天文学家说,在宇宙年龄只有10亿年时,就形成了这么大质量的黑洞,对现有的宇宙早期黑洞形成理论模型提出了挑 Chinese and foreign astronomers have discovered the largest known black hole. The mass of this black hole is equivalent to 12 billion sun, 12.8 billion light years from the earth, about a billion years after the birth of the universe. In contrast, the black hole in the center of the galaxy is only about 3 million sun masses. Astronomers say that when the age of the universe was only one billion years old, such a massive black hole was formed and the existing theoretical model for the formation of the early black hole in the universe was put forward