Gravitatsioonijõul

Gravitatsioonijõul, also known as gravity or gravitational force, is a fundamental force of nature that causes objects with mass to attract each other. This force is mediated by the curvature of spacetime, which is a fundamental concept in Albert Einstein's theory of general relativity.

The acceleration of an object due to gravity is directly proportional to the mass of the object and inversely proportional to the square of the distance between the object and the center of mass of the system. This relationship is described by Newton's law of universal gravitation, which was formulated by Sir Isaac Newton in the 17th century.

Gravitational force is the weakest of the four fundamental forces in nature, but it is the only force that affects objects with mass over large distances. The force of gravity between two objects depends on their masses and the distance between them, but it always acts along the line of action connecting the centers of mass of the two objects.

Gravitational attraction between objects is what holds planets in orbit around their stars and what keeps galaxies together. The effects of gravity are also observed in the behavior of falling objects on Earth and in the atmospheric escape from a planet's surface. Gravitational waves, which were first detected in 2015, are ripples in the curvature of spacetime that are produced by massive, accelerating objects.

Overall, the concept of gravitatsioonijõul is a crucial aspect of understanding the behavior of objects in the universe, from the smallest subatomic particles to the vast expanse of galaxy clusters.