What keeps the Earth suspended in the air, and how does an artificial satellite work?

The reason why the sun is suspended in the air is because there is no gravitational force in the universe, and artificial satellites are powering themselves by absorbing solar energy.

The reason why the earth is suspended is because of gravity, and the reason why artificial satellites are orbiting is also because of gravity, so to speak, all because of gravity.

The Earth hangs in the air because of gravity! The higher an artificial satellite is flared, the less air resistance it will experience when it operates. In order for a satellite to be in the air for a long time, it is necessary to launch it very high with a powerful rocket to minimize the effects of air resistance.

The earth revolves around the sun, because the sun has gravity, which keeps the earth at a certain distance from him, and there is solar energy on the artificial satellite, which can be powered by the sun.

What makes the Earth levitate in the air? After watching the operation of the artificial satellite, I realized that the cause came from the sun.

This is because there is the gravitational pull of the earth. The harder the stone is thrown, the higher the speed at which the stone flies out, and the farther the distance it flies. If the speed of the stone when it flies out is high enough, and the trajectory of the downward bend under gravity during flight is the same as that of the earth, then how much the stone bends downwards under gravity, and how much the ground bends downward, the stone will not fall back to the ground, and it will be an artificial satellite orbiting the earth.

Therefore, in order for an artificial satellite not to fall back to the ground, it is necessary to give the artificial satellite sufficient speed. This velocity is the Earth's first cosmic velocity, also known as orbital velocity, and its magnitude is kilometers and seconds.

The shape of an artificial satellite.

Artificial satellites are mostly designed to be streamlined in the shape of a ball, a shuttlecock or a gyroscope to reduce resistance in space. The altitude of an artificial satellite varies according to its function. It orbits in space by inertia, and when it is subjected to resistance, it gradually descends, and burns down and falls.

So, in order to prolong its life, it is usually shot as high as possible.

In order to fly an artificial satellite at an altitude of several hundred or even tens of thousands of kilometers, it is necessary to have a powerful rocket engine and excellent high-energy fuel as propellant; Due to the high jet velocity of the rocket, the shell of the rocket and the nozzle of the engine need to be made of special materials. In addition, when creating the shell of the rocket body, it is also necessary to pay attention to the uniformity and integrity of its shape. Because if there are slight wrinkles or cracks in the shell of the rocket body, or a slight deviation in the shape and structure of the symmetrical geometry, then when the fire rises into the air, the high-speed friction force will break the shell of the rocket body.

Artificial satellites are mostly designed to be streamlined in the shape of a ball, a shuttlecock or a gyroscope to reduce resistance in space. The altitude of an artificial satellite varies according to its function. It orbits in space by inertia, and when it is subjected to resistance, it gradually descends, and burns down and falls.

So, in order to prolong its life, it is usually shot as high as possible.

In order to fly an artificial satellite at an altitude of several hundred or even tens of thousands of kilometers, it is necessary to have a powerful rocket engine and excellent high-energy fuel as propellant; Due to the high jet velocity of the rocket, the shell of the rocket and the nozzle of the engine need to be made of special materials. In addition, when creating the shell of the rocket body, it is also necessary to pay attention to the uniformity and integrity of its shape. Because if there are slight wrinkles or cracks in the shell of the rocket body, or a slight deviation in the shape and structure of the symmetrical geometry, then when the fire rises into the air, the high-speed friction force will break the shell of the rocket body.

The first point: satellites orbit the earth, they do not fly out or fall, in the final analysis, it is the effect of gravity. The tension of the rope provides the centripetal force of the stone, and the stone wants to fly out but the centrifugal force is confined to a certain point to reach equilibrium, and the same is true for celestial bodies, except that the rope between the two celestial bodies is gravitational, and this force just confines the celestial body to a suitable orbit and moves at a certain speed, and it will neither fly out nor be sucked in.

Imagine the Sun attracting eight planets in their different orbits and at different speeds. The launch of artificial satellites by humans is exactly such a pattern. Artificial satellites usually include geostationary satellites and low-orbit satellites, the former has a higher orbit and a slower orbit (the same speed as the Earth's rotation), and always remains relatively stationary with a certain point on the Earth, such as meteorological satellites; The latter have a low orbit and are very fast, like military reconnaissance satellites.

The second point: it is normal for satellites to fall, scrapping is the life of life, artificial satellites have a service life, artificial satellites are still very thin air because they are about 800 kilometers from the ground, so there will be resistance when running, the resistance makes the satellite slow down in the orbit, but the gravitational force has not changed, so the centrifugal force is not enough to balance the earth's gravity, and it will be pulled back to the atmosphere by the earth. As for the satellites that fall, the vast majority will burn up in the atmosphere (which is also expected), and very few will not burn up and fall to the ground.

It should be clear.

The energy of the satellite generally comes from the sun, and it revolves around the earth because the earth has a very large gravitational field that can capture the satellite, and the satellite is kept in a reasonable range with the earth, so that the satellite will not be pulled into the earth by gravity and rotate with the earth.

The energy of the artificial satellite comes from the centripetal force between the artificial satellite and the earth, which can make the artificial satellite continue to move, and the speed of the artificial satellite is particularly fast, so it can overcome the downward pull force and rotate around the earth all the time.

Gravitational attraction. Because as long as it is at a certain velocity, the centrifugal force will be equal to the gravitational force. And there is no frictional resistance in space, so it can move all the time.

The vast majority of artificial satellites use rocket engines as propulsion power when they are launched, and their internal power after liftoff mainly includes storage batteries, solar cells, and nuclear batteries. The energy comes from the chemical reactions inside the battery, the light energy of sunlight, and the heat energy produced by the decay of radioactive elements.

The energy, of course, comes from the universe. Artificial satellites do not fly on energy, but through the mutual gravitational pull of the universe to keep it flying.

** to high technology, and these energies are also the energies of the universe. And this energy is also very powerful, so it can rotate around the earth.

Artificial satellites orbiting the Earth have kinetic and potential energy.

Data Extension:

An unmanned spacecraft that orbits the Earth with an artificial satellite. Artificial satellites basically orbit the earth according to the laws of celestial mechanics, but the actual motion is very complicated due to the influence of the non-spherical earth's gravitational field, atmospheric drag, solar gravity, moon gravity and light pressure in different orbits.

Artificial satellites are the most numerous, most versatile, and fastest-growing spacecraft launched. The number of satellites launched accounts for more than 90 per cent of the total number of spacecraft launched.

Artificial satellites can be divided into three main categories: scientific satellites, technical test satellites and application satellites. Scientific satellites are satellites used for scientific exploration and research, mainly including space physical exploration satellites and astronomical satellites, which are used to study the atmosphere, radiation belts, magnetosphere, cosmic rays, solar radiation, etc. of a certain planet, and can observe other stars.

Satellite refers to all celestial bodies in the universe orbiting around planets, orbiting which planet, it is called the planet's satellite, for example, the moon revolves around the earth, it is the earth's satellite. The "artificial satellite" is the "artificially created satellite" of our human megalobe.

Scientists use rockets or other vehicles to launch it into a predetermined orbit around the Earth or other planets for exploration or scientific research. The Earth has a gravitational pull on the surrounding objects, so the thrown object will fall back to the ground, but the greater the initial velocity of the throw, the farther the object will fly.

When Newton thought about the law of gravitation, he imagined that when an object is thrown from a high mountain with different horizontal velocities, the speed is larger and the landing point is farther and farther from the foot of the mountain.

If there is no air resistance, the object will never fall to the ground when the speed is high enough, and it will rotate around the earth to become an artificial earth satellite moving around the earth, referred to as artificial satellite. Artificial satellites are the most numerous, most versatile, and fastest-growing spacecraft launched.

It is a man-made object that flies around a planet.

1) Meteorological satellite: An artificial earth satellite that conducts meteorological observations of the earth and its atmosphere from space. Space segment of the Satellite Meteorological Observing System.

The satellites carry various meteorological remote sensors that receive and measure visible, infrared and microwave radiation from the Earth and its atmosphere, and convert them into electrical signals for transmission to ground stations.

2) Earth observation satellites: Earth observation satellites generally refer to various artificial earth satellites and spacecraft used for remote sensing of earth resources and environment. Earth observation satellites mainly include meteorological satellites, land satellites, oceanographic satellites, orbital space stations and other satellites for special purposes.

People can use earth observation satellites for monitoring to obtain large-area observation data, and finally can effectively achieve comprehensive geographic differential analysis data.

3) Astronomical satellites: Astronomical satellites are artificial earth satellites used to observe cosmic celestial bodies and other space materials in a virtual state. Astronomical satellites operate in orbits several hundred kilometers or higher than the ground, and because they are not blocked by the atmosphere, the instruments on board the satellites can receive from celestial bodies from radio bands to infrared bands and visible light bands, which are the "clairvoyants" placed by human beings in space.

4) Application satellites: A general term for various artificial earth satellites that directly serve the national economy and the military. Obviously, communication satellites are one of the application satellites.

A broadcast satellite is a specialized communication satellite that is mainly used for television broadcasting. It functions as a space broadcasting transmitter.