50 from outer space to Earth, from outer space to Earth

I don't know if I'm useful or not, but I like to know about space.

First of all, the earth is surrounded by a thick atmosphere, and when an object enters, it generates heat due to air friction, causing it to burn. To make an analogy, it will definitely be much easier to drill in a place with more people than to drill in a place with fewer people, so when entering the earth's atmosphere, you will choose the angle and the force area of the spacecraft, and gradually enter. Just like launching from Earth, you have to choose an angle.

I can't say what it's like to look back at the Earth from space, but when I look at the pictures on TV, it's really beautiful.

What does it feel like to look back at Earth from outer space? What it feels like to look at the stars. It depends on what kind of mood the stars are in at the time. What it's like to look back at Earth from outer space. It depends on what kind of mood you use to see it.

Of course! You know, the earth is rotating. The speed at which the actual vehicle enters the atmosphere is not equal to the linear velocity of the Earth's rotation, so the path must be calculated in detail before entering.

Due to the rapid linear speed of the Earth's rotation (especially at the equator), it is more likely to be "a small miss, a thousand miles" at this time. In the same way, if you aim for land, if you don't take into account the trajectory and speed, you may not necessarily end up crashing into land, and you may also fall into the sea.

Of course, you have to choose a location, or where to find the rescuers, and generally choose to land in a relatively open place, just like the Mongolian steppe that I have passed, which is very suitable for landing.

There is an atmosphere on the periphery of the earth, and entering the atmosphere is equivalent to entering the earth, and there is a deceleration device on the aircraft, which is the umbrella that is dragged behind the aircraft.

What kind of feeling did you ask Didn't you watch the live broadcast of Yang Liwei's flight at that time? I feel like I'm a fairy.

That's for sure. And to look at the size of the lander. Generally, if there are people in the ocean, there will be more land.

There is a parachute back when landing on land. See the Earth from space. You'll see a huge blue planet.

I think there will be a taste of immortality.

I don't know what you said about entering the earth from outer space, the spacecraft has two protections, one is a parachute, and the other is a ceramic heat shield attached to the shell. When you say that you see the earth from the universe, I tell you, it is the feeling of becoming an immortal.

The earth is a member of the solar system, and there are only planets of the members of the solar system around the earth, and other planets are too far away from the earth, so the earth is surrounded by space.

The Chinese word "earth" first appeared during the Ming Dynasty, when it was first introduced by the Italian missionary Matteoricci (1552 1610), who used it in the Kunyu Wanguo Quantu. In the late Qing Dynasty, Western modern science was introduced into China, and the earth circle theory was gradually accepted by the Chinese, and the word "earth" (also known as "earth circle") was widely used, and the article "Earth Theory" was published in the first month of the journal.

OK.

There is a type of satellite called a geostationary satellite, which means that the speed at which it revolves around the earth is equal to the speed at which the earth rotates.

This velocity v = km r, k is a constant, m is the mass of the earth, and r refers to the distance from the earth to the satellite.

It is not difficult to see that when your position is above the synchronous orbit r, you are stationary relative to the Earth, and you will never see the Earth rotate in this position;

When the distance between you and the earth is less than r (synchronous orbit height), your speed is greater than the earth's rotation speed, then you see the earth rotating in the opposite direction, because you are faster than it, when the distance between you and the earth is greater than r, your speed is less than the earth's rotation speed, then you can clearly see the earth's rotation motion. However, the observed velocity is inconsistent with the actual rotation speed of the Earth (within the Earth's gravitational field).

In the Sun-Earth orbit, out of the gravitational range of the Earth, you should be able to accomplish your mission.

Space refers to the area of space outside the dense atmosphere of the Earth, that is, the area of the void outside the atmosphere in the Earth's sky. There is no clear dividing line. It is generally defined as space approximately 1,000 kilometers above the Earth's surface.

So it can also be said that space is outside the earth.

There is no clear boundary between space and the Earth's atmosphere, as the atmosphere gradually thins with increasing altitude. Assuming a constant atmospheric temperature, the atmospheric pressure will decrease exponentially from about 1000 hPa at sea level to zero as the altitude increases.

The International Aeronautical Federation (IAF) in Geneva, Switzerland, defines the boundary between the atmosphere and space: the boundary between the atmosphere and space is 100 kilometers above sea level, known as the Kármán line.

Physicists divide the atmosphere into 5 layers: troposphere, stratosphere, mesosphere, thermosphere, and outer atmosphere. The outer edge of the stratosphere is the maximum limit at which an aircraft can fly with air support.