以下为句子列表：
英文: At that time, the Newtonian theory of gravity and the concept of escape velocity were well known.
中文: 那时，牛顿引力理论和逃逸速度的观念是广为人知的。
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英文: At the event horizon, the escape velocity is equal to the speed of light.
中文: 在活动视界里，逃逸速度等于光速。
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英文: Michell computed that a body 500 times the radius of the Sun and of the same density would have at its surface an escape velocity equal to the speed of light, and therefore would be invisible.
中文: 米切尔计算一个500倍太阳半径而且具有相同密度的物体就会具有它的表面逃逸速度等于光速,而因此不可见。
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英文: When the escape velocity at a certain distance from the center reaches the speed of light, an event horizon is formed within which matter must inevitably collapse onto a single point, forming a singularity.
中文: 当离中心某个距离的逃逸速度达到光速，形成一个活动视界，在里面的物质一定不可避免在单一点之上坍塌,形成一个奇异点。
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