Schwarzschild Singularity & Black Hole: Same or Different?

jeremyfiennes
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Are a Schwarzschild singularity and a black hole the same thing?
 
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The term "Schwarzschild singularity" has been used with several different meanings. It can mean a black hole; it can mean the horizon of the hole; or it can mean the singularity at ##r = 0##.
 
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Does the speed of light change in a gravitational field depending on whether the direction of travel is parallel to the field, or perpendicular to the field? And is it the same in both directions at each orientation? This question could be answered experimentally to some degree of accuracy. Experiment design: Place two identical clocks A and B on the circumference of a wheel at opposite ends of the diameter of length L. The wheel is positioned upright, i.e., perpendicular to the ground...
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Thread 'How can a black hole absorb matter?'

According to the General Theory of Relativity, time does not pass on a black hole, which means that processes they don't work either. As the object becomes heavier, the speed of matter falling on it for an observer on Earth will first increase, and then slow down, due to the effect of time dilation. And then it will stop altogether. As a result, we will not get a black hole, since the critical mass will not be reached. Although the object will continue to attract matter, it will not be a...
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