Gravitational force - the foundation on which the Universe holds. Thanks to the strength of gravity, the Sun does not explode, the atmosphere does not disappear into space, people and animals move freely on the surface, and the plants are fruit.
Heavenly Mechanics and Relativity Theory
The law of global gravity is studied in the 8-9 grade of high school. The diligent disciples know about the famous apple fallen on the head of the Great Isaac Newton and about the discoveries that followed by this. In fact, give a clear definition of gravity is much more complicated. Modern scientists continue discussions on the topic, as body interact in open space and whether there is anti-gravity. Examine this phenomenon in earthly laboratories is extremely difficult, therefore several basic gravity theories are distinguished:
Newtonian gravity
In 1687, Newton laid the foundations of heavenly mechanics, which studies the movement of bodies in an empty space. He calculated the strength of the attraction of the moon to the ground. According to the formula, this force directly depends on their mass and distance between objects.
F \u003d (G M1 M2) / R2
Gravitational constant G \u003d 6.67 * 10-11
The equation is not entirely relevant when a strong gravitational field is analyzed or the attraction of more than two objects.
Einstein gravity theory
In the course of various experiments, scientists concluded that there are some errors in Newton's formula. The basis of the celestial mechanics is the long-range force, triggering instantly in independence from the distance, which does not correspond to the theory of relativity.
According to A.Einstein's theory developed in the early 20th century, the information does not apply faster than the speed of light in vacuum, therefore gravitational effects arise as a result of deformation of space-time. The greater the mass of the object, the more curvature in which lighter objects are rolling.
Quantum gravity
Very contrary to both the formed theory, which explains the interaction of bodies as the exchange of special particles - graviton.
At the beginning of the 21st century, scientists managed to spend several significant experiments, including with the help of a hadron collider, and develop the theory of loop quantum gravity and string theory.
Universe without gravity
In fantastic novels, various gravitational distortion, anti-gravitational chambers and space ships with an artificial gravitational field are often described. Readers sometimes do not even think about how unpaid stories of books and what will happen if the strength of gravity decreases / increases or completely disappears.
- The person is adapted to earthly gravity, so in other conditions he will have to radically change. Geeness leads to muscle atrophy, reducing the number of erythrocytes and violation in the work of all vital systems of the body, and with an increase in the gravitational field, people simply will not be able to move.
- Air and water, plants and animals, houses and cars will fly into open space. Even if people manage to stay quickly die without oxygen and food. Low gravity on the moon is the main reason for the lack of an atmosphere, respectively, and life.
- Our planet will fall apart on the part, because the pressure will disappear in the very center of the Earth, the eruption of all existing volcanoes will begin and the discrepancy between the tectonic plates.
- Stars will explode due to strong pressure and chaotic collisions of particles in the core.
- The universe will turn into a shapeless stew from atoms and molecules that are unable to connect to create something more.
Fortunately for humanity, disabling gravity and terrible events that will never happen for this. A dark scenario simply demonstrates how important gravity is. It is much weaker than electromagnetism, strong or weak interaction, but in fact without it our world will cease to exist.
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