So my understanding is because E=mc^2, and kinetic energy is included in E, something moving quickly relative to you gains mass in your reference frame, compared to that same object at rest. Black holes are dependent on density, which is dependent on mass and volume. If an object at rest is very close to being a black hole but not quite there, and then you move relative to it, would it appear to become a black hole? What are the ramifications of that?
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