How far is Earth from space? How many kilometers from the Earth is the space station

There are various theories about the distance from space to the ground:

1. For a long time, scientists have had different opinions on the "boundaries of space". Some scientists have believed that astronauts at sea level.

At 80 kilometers it was already in space.

2. American-Hungarian.

Theodore von Kallmann, a scientist, believes that the "space limit" is about 100 kilometers above sea level. This criterion is endorsed by the Fédération Internationale de la Aeronautical Federation.

3. According to Kalman, the atmosphere in that altitude region is negligible and the plane is no longer able to reach the speed at which it can gain aerodynamic lift. However, the National Aerospace.

The National Security Agency (NASA) has never officially established any "space boundary" standard, arguing that it would complicate the definition of override rights for satellites and other Earth-orbiting vehicles.

4. Some scientists believe that the arrival of an aircraft at a distance of 21 million kilometers from the sea level marks "entering space", because when the aircraft arrives there, it is subjected to the gravitational pull of the earth.

It has canceled each other out with other forces and is in a state of weightlessness.

According to international regulations, space is considered 100 kilometers away from the earth's surface.

Generally speaking, within 100 kilometers is counted as the Earth's atmosphere, not space. More than 100 km, even if it is space.

People can "float" in space, at least 400 kilometers away from the earth, which is considered space, but this is what we call "astronautics" or "astronautics"; Our civil aircraft are generally at an altitude of 10,000 meters above the earth, and we call it "aviation".

The Earth is about 370 km from space, although the lowest orbit of an artificial satellite, for example, the Earth is generally no more than 370 km (in the thermosphere, ionosphere, 80,370 km). How far the Earth is from space, in fact, scientists have not yet given a unified cut-off value.

Space refers to the cosmic space outside the Earth's atmosphere, the entire space outside the atmospheric space.

Physicists divide the atmosphere into five layers: the troposphere (sea level up to 10 km), the stratosphere (10 40 km), the mesosphere (40 80 km), the thermosphere (ionosphere, 80 370 km) and the outer atmosphere (ionosphere, above 370 km). About 3.4 percent of the atmosphere above the Earth is in the troposphere and 97 per cent below the stratosphere, the outer edge of which is the maximum limit for aircraft to fly with air support.

Some high-altitude rockets can enter the middle layer. The lowest orbit of an artificial satellite is within a thermolayer, and its air density is 1% of the Earth's surface. Air continues to exist at altitudes of 10,000 km, and there are still airborne particles even at altitudes of 100,000 km.

From a strictly scientific point of view, there is no clear boundary between airspace and outer space, but rather a gradual convergence. The Scientific and Technical Subcommittee of the United Nations Committee on the Peaceful Uses of Outer Space noted that it was not yet possible to come up with precise and lasting scientific criteria for delineating outer space and airspace. In recent years, there has been a trend towards the minimum altitude of satellites off the ground (100,110) kilometres as the minimum limit for outer space.

The atmosphere has thinned out with increasing altitude, so there is no clear boundary between space and the Earth's atmosphere, and astronomers have only briefly defined the distance from Earth to space as follows:

1. The boundary card with a vertical height of 100 kilometers is defined as the door line with zero altitude on the earth's horizontal plane as the reference starting point, and the area outside the Kármán line is classified as the category of space;

2. Take the lowest height of the artificial satellite from the ground as the boundary distance between the earth and space, that is, the vertical altitude of 100 to 110 kilometers is regarded as the distance between the earth and space.

The space station is located 400 kilometers from Earth.

The construction of the space station is an important goal in the development strategy. The space station is the same as the ISS in terms of time, flight speed, and orbital altitude around the Earth. The Tianhe core module of the space station was successfully launched on April 29, 2021, and is expected to be completed in 2022.

Related Events. The International Space Station orbits the Earth at a speed of 10,000 kilometers per hour in orbit about 400 kilometers above the Earth's surface, which is equivalent to circumnavigating the Earth every 90 minutes.

This "monumental circumnavigation" of the Earth lasted from 7:35 to 9:10 local Moscow time (4:35 to 6:10 GMT). Jeff Williams, an American flight engineer who is currently serving on the space station, said in a note: "This is a significant milestone and a tribute to the international cooperation between the European Space Agency, Russia, Canada, Japan and the United States."

The first components of the ISS were launched on November 20, 1998, and in the following decades expanded from two to 15 capsules, the equivalent of an area of a football field in space, with a total investment of about $100 billion.

The ISS usually has six astronauts, including three Russian cosmonauts, two American astronauts and one British astronaut. According to statistics, 226 people from 15 countries and regions have visited the space station.

2000-3000 km, this is the shortest distance into space.

When in doubt, please ask

The Earth is a hundred kilometers from space.

Space, as explained in the Chinese dictionary, is extremely high in the sky. The International Air Federation in Geneva, Switzerland, defines the boundary between the atmosphere and space: the boundary between space at an altitude of 100 kilometers above the Earth's sea level, known as the Kármán line.

About 75% of the atmosphere above the Earth is in the troposphere and 97% below the stratosphere. The density of air in the thermosphere is 1% of the Earth's surface, and air continues to exist at an altitude of 10,000 kilometers in outer space, and there are still air particles at an altitude of 100,000 kilometers. Therefore, there is no clear boundary between airspace and outer space.

The orbital altitude of China's space station is 400 to 450 kilometers, and it is an inclined orbit. This orbit belongs to low-Earth orbit.

The Tianhe core module of the Tiangong space station will remain in low-Earth orbit at an altitude of about 400 to 450 kilometers.

But when docking with the Shenzhou manned spacecraft or the Tianzhou cargo spacecraft, the orbital altitude will drop to about 390 kilometers. This is to save fuel for the launch vehicle and increase the carrying capacity of the rocket. After the docking is completed, the space station spacecraft assembly will return to an altitude of more than 400 kilometers.