Gravity
Gravity is said to be a natural phenomenon by which all things with mass are brought toward one another, including objects ranging from atoms and photons, to planets and stars. Since energy and mass are equivalent, all forms of energy such as light cause gravitation and are under the influence of it. On Earth, gravity gives weight to physical objects, and the Moon's gravity causes the ocean tides. The gravitational attraction of the original gaseous matter present in the Universe caused it to begin coalescing, forming stars – and for the stars to group together into galaxies – so gravity is responsible for many of the large scale structures in the Universe. Gravity has an infinite range, although its effects become increasingly weaker on farther objects.
Gravity is accurately described by the general theory of relativity (proposed by Albert Einstein in 1915) which describes gravity not as a force, but as a consequence of the curvature of spacetime caused by the uneven distribution of mass.However, for most applications, gravity is well approximated by Newton's law of universal gravitation, which describes gravity as a force which causes any two bodies to be attracted to each other, with the force proportional to the product of their masses and inversely proportional to the square of the distance between them.
Gravity can also be described as the weakest of the four fundamental forces of physics, approximately 1038 times weaker than the strong force, 1036 times weaker than the electromagnetic force and 1029 times weaker than the weak force. As a consequence, it has no significant influence at the level of subatomic particles.[2] In contrast, it is the dominant force at the macroscopic scale, and is the cause of the formation, shape and trajectory (orbit) of astronomical bodies.
Gravity is said to be a natural phenomenon by which all things with mass are brought toward one another, including objects ranging from atoms and photons, to planets and stars. Since energy and mass are equivalent, all forms of energy such as light cause gravitation and are under the influence of it. On Earth, gravity gives weight to physical objects, and the Moon's gravity causes the ocean tides. The gravitational attraction of the original gaseous matter present in the Universe caused it to begin coalescing, forming stars – and for the stars to group together into galaxies – so gravity is responsible for many of the large scale structures in the Universe. Gravity has an infinite range, although its effects become increasingly weaker on farther objects.
Gravity is accurately described by the general theory of relativity (proposed by Albert Einstein in 1915) which describes gravity not as a force, but as a consequence of the curvature of spacetime caused by the uneven distribution of mass.However, for most applications, gravity is well approximated by Newton's law of universal gravitation, which describes gravity as a force which causes any two bodies to be attracted to each other, with the force proportional to the product of their masses and inversely proportional to the square of the distance between them.
Gravity is the weakest of the four fundamental forces of physics, approximately 1038 times weaker than the strong force, 1036 times weaker than the electromagnetic force and 1029 times weaker than the weak force. As a consequence, it has no significant influence at the level of subatomic particles.[2] In contrast, it is the dominant force at the macroscopic scale, and is the cause of the formation, shape and trajectory (orbit) of astronomical bodies.
Advantages and Disadvantages of gravity
Fun in Space
Zero gravity means you can float in the air without having to use any energy to support your weight. As long as this situation endures, you won't have to worry about back pain and sore feet. You can move yourself around just by pushing off from a surface. Once you are in motion, you won't have to use your body to keep moving. Your velocity remains constant after you set yourself in motion.
Bone and Muscle Loss
The disadvantages of zero gravity include bone loss, which is one of the most serious side effects of long-term weightlessness. The stress of Earth’s gravity is what keeps bones strong. In space, or any weightless environment, bones undergo little, if any, stress. Over time, the bones begin to deteriorate. Worse, scientists have figured out how to recuperate only some of the bone loss after astronauts return from long space voyages. There also is a similar loss of muscle.
Fluid Redistribution
Without gravity pooling blood and other fluids in the lower parts of your body, fluids redistribute throughout your anatomy. The brain interprets this as a high fluid level and causes you to excrete more fluids. This can easily lead to dehydration, a constant concern for astronauts.
Space Adaptation Syndrome
Space adaptation syndrome, also known as space sickness, is caused by the immune system becoming weakened in a zero gravity environment. About half of astronauts complain of this syndrome’s symptoms, which include nausea and headaches. It typically lasts for a few days.
Inhaling Things
What many people do not consider is that everything else is floating around as well. If fellow astronauts are not extremely careful, you might be hit by objects not properly secured. It is easy for an astronaut to inhale particles of food or water that float past. Astronauts even have to use special electric razors equipped with vacuums so that they don’t inhale their own whiskers and choke.
Balance Disorders
After returning to Earth, many astronauts suffer balance disorders. This is due to disorientation in the inner ear, which controls balance. Many returned astronauts suffer from dizziness for days and cannot keep their balance. This leaves them somewhat incapacitated until they regain a sense of equilibrium.
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