what is a black hole
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A black hole is a region of spacetime exhibiting gravitational acceleration so strong that nothing—no particles or even electromagnetic radiation such as light—can escape from it. ... This temperature is on the order of billionths of a kelvin for black holes of stellar mass, making it essentially impossible to observe.
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black hole is the phenomenon when ozone layer is becomes thin due to decomposition by chlorine release by CFC which is present in stratosphere ,this black hole allow harmful sun rays to enter and cause skin cancer, cataract etc.
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