| abstract
| - Artificial Gravity and Antigravity are two techniques used to create a real or substitutive gravitational field or defy a gravitational field, respectively. Gravity is one of the four fundamental interactions of nature (along with strong interaction, electromagnetism and weak interaction), in which objects with mass attract one another. Gravity is the agent that gives weight to objects with mass and causes them to fall to the ground when dropped. Gravity causes dispersed matter to clump together, thus accounting for the existence of the Earth, the Sun, and most of the macroscopic objects in the universe. Gravity is responsible for keeping the Earth and the other planets in their orbits around the Sun, and for various other phenomena observed on Earth and elsewhere in the universe. Modern physics describes gravity using the general theory of relativity, in which gravity is a consequence of the curvature of spacetime, which governs the motion of inertial objects.
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