x-ray binary x
x射线二进制x
以上为机器翻译结果，长、整句建议使用 人工翻译 。
The black holes are separated by an estimated distance of less than a third of a light-year - cheek-to-cheek by black hole standards and significantly closer than the postulated binary system spotted by the Chandra X-ray Observatory in 2003.
BBC: Dancing black hole twins spotted
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