Gravitational forces are the invisible pull exerted by a mass upon another mass within the universe, described fundamentally in Isaac Newton’s law of universal gravitation and later refined by Albert Einstein’s theory of general relativity. This force is omnipresent, acting between all particles possessing mass, including subatomic particles.

In their basic form, gravitational forces operate in direct proportion to the product of two masses and inversely proportional to the square of their distance. This force facilitates planetary orbits around stars, holds galaxies together, and influences light paths, creating phenomena such as gravitational lensing.

Einstein’s general relativity posits that gravity is not a force transmitted through space but a curvature of spacetime caused by mass and energy. Thus, an object moving along this curved path experiences what we perceive as gravity. The precise measurements from GPS satellites and time dilation experiments corroborate this perspective.

Despite its ubiquitous presence and profound influence on cosmic structure, gravity remains the weakest of the four fundamental forces in nature. Its weakness paradoxically allows for the formation of complex structures like galaxies and life itself – too strong a force would crush such complexities before they could evolve.

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**Search Intent:**
Understanding gravitational forces in physics.

**Semantic Relevance:**
Related to the force of attraction between objects with mass.

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Gravity, Newton’s laws of motion, Astrophysics

Gravity, Gravitational pull, Gravitational attraction

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Weightlessness in space, Orbits around celestial bodies, Escape velocity

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Global relevance in physics and astronomy studies.

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