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For a body of a given mass, the radius beneath which that body's gravitational field will take on the properties of a black hole, preventing the escape of all matter and energy. The Schwarzchild radius represents an immensely compacted state - for example, it has been calculated that the Schwarzchild radius of the entire Earth is of the order of one centimetre. The forces required to collapse a body to this extent are such that only the most massive stars (far more massive than the Sun) have the potential to reach it.
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