A hypothetical force or technology that would counteract gravity and allow objects to float or levitate without falling.
From anti- (against) + gravity (the force pulling objects downward). Coined in the 20th century as science fiction writers and physicists speculated about counteracting Earth's gravitational pull.
While antigravity remains purely theoretical, NASA and physicists continue researching whether exotic matter or manipulating spacetime could one day make it real—it's the ultimate physics Holy Grail that keeps scientists dreaming.
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