SYDNEY (Reuters) - Scientists say they have discovered a black hole so big that it challenges the theory about how they grow.
悉尼（路透社）——科学家们说，他们发现了一个非常巨大的黑洞，以至于挑战了旧的增长理论。

But with measurements indicating it is 12 billion times the size of the Sun, the black hole challenges a widely accepted hypothesis of growth rates.
但是，测量数据表明，它的体积相当于120亿个太阳，这个黑洞挑战了已被接受的黑洞增长假说。
"Based on previous research, this is the largest black hole found for that period of time," Dr Fuyan Bian, Research School of Astronomy and Astrophysics, Australian National University (ANU), told Reuters on Wednesday.
澳大利亚国家大学天文学与天体物理学研究员边富阳博士说，"基于先前的研究，这是在那个时间点发现的最大的黑洞，"
"Current theory is for a limit to how fast a black hole can grow, but this black hole is too large for that theory."
"依据当前的理论，黑洞的增长速度是有极限的，但是，这个黑洞太大了，以致超越了这个极限。"
The creation of supermassive black holes remains an open topic of research. However, many scientists have long believed the growth rate of black holes was limited.
这个特大黑洞的发现在科研界得到持续的关注。然而，很多科学家依然相信黑洞增长速度存在极限。
Black holes grow, scientific theory suggests, as they absorb mass. However, as mass is absorbed, it will be heated creating radiation pressure, which pushes the mass away from the black hole.
黑洞会增长，科学理论认为，是来自于他吸引物质的能力。然而，物质被吸收，会导致高温，产生辐射压强，反而导致物质远离黑洞。
"Basically, you have two forces balanced together which sets up a limit for growth, which is much smaller than what we found," said Bian.
"基本上，由于引力斥力最终平衡，从而使体积增长存在上限，这个上限比我们发现的这个黑洞要小得多。"
The black hole was discovered a team of global scientists led by Xue-Bing Wu at Peking University, China, as part of the Sloan Digital Sky Survey, which provided imagery data of 35 percent of the northern hemisphere sky.
这个黑洞是被北京大学吴学兵所领导的国际科研团队发现的，这个团队是史隆数位巡天计划的一部分，这个计划提供了整个北星空35%的影像数据。
The ANU is leading a comparable project, known as SkyMapper, to carry out observations of the Southern Hemisphere sky.
澳大利亚国立大学也在主导一个类似的工程，叫做SkyMapper，制作整个南星空的影像数据。
Bian expects more black holes to be observed as the project advances.
边博士希望在这个工程中会发现更多黑洞。