The center of mass or balance point of an object or system, where weight is evenly distributed in all directions.
From Greek 'barys' (heavy) + 'kentron' (center). The term emerged in physics during the 17th-18th centuries as scientists developed more sophisticated understanding of gravity and mass distribution.
The barycenter of the Earth-Moon system isn't actually at Earth's center—it's about 1,700 miles below Earth's surface because the Moon pulls on our planet's mass! Astronomers use this concept to detect exoplanets orbiting distant stars.
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