Black hole is the high-mass compact object, which is result of the gravity collapse of the star and most of the black hole system is X-ray nova.
黑洞是经过恒星引力塌缩而形成的一种质量较大的致密天体，几乎所有的黑洞系统是X射线新星。
Black hole is the high-mass compact object, which is result of the gravity collapse of the star and most of the black hole system is X-ray nova.
黑洞是经过恒星引力塌缩而形成的一种质量较大的致密天体，几乎所有的黑洞系统是X射线新星。
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