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Free online encyclopedia providing authoritative information on scientific topics including physics, astronomy, and gravitational theory. For more than 250 years, Britannica has kindled the spark of curiosity with stories of discoveries, people and events that changed the world.
EducationScientific Definition of 'Up' and Its Relationship to Gravity
The scientific definition of 'up' as the direction opposite to gravity, explaining why this directional relationship is fundamental to physics and everyday experiences.
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