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ground zero - the point of detonation (or above or below) of a nuclear weapon. point - the precise location of something; a spatially limited location; she walked to a point where she could survey the whole street.
Absolute zero is the temperature (-273.15C) at which all motion in matter stops and is thought to be unreachable. But recent experiments using ultracold atoms have measured temperatures that are, in fact, negative in absolute temperature scale.