gravitaatiovuorovaikutus

Gravitaatiovuorovaikutus, often referred to as gravity, is one of the four fundamental forces of nature. It is the force of attraction between any two objects that have mass. The more massive an object, the stronger its gravitational pull. Similarly, the closer two objects are, the stronger the gravitational force between them. This force is responsible for keeping planets in orbit around stars, stars within galaxies, and galaxies within clusters.

The modern understanding of gravity is described by Albert Einstein's theory of general relativity. This theory posits that gravity is not a force in the traditional sense, but rather a curvature of spacetime caused by the presence of mass and energy. Massive objects warp the fabric of spacetime around them, and other objects moving through this warped spacetime follow paths that we perceive as being influenced by a gravitational force.

Newton's law of universal gravitation, developed centuries earlier, provides a very accurate approximation of gravity's effects in most everyday situations and for most astronomical calculations. It states that the gravitational force between two objects is directly proportional to the product of their masses and inversely proportional to the square of the distance between their centers.

While gravity is the weakest of the four fundamental forces at the microscopic level, it is dominant on a large scale due to the fact that it is always attractive and acts over infinite distances. It plays a crucial role in the formation and evolution of cosmic structures.