With a countdown, countless people in front of TVs and mobile phones around the world couldn't help but stop everything in their hands at this moment, looked at the countdown screen, and couldn't help but read along.

In the middle of the school, the teacher takes the students.

In the company, the boss takes the staff.

Inside the bar, the drinkers followed the waiters.

In the restaurant, diners forgot what was on the table.

In such a short countdown, countless people around the world seem to have participated.

“3，2，1！”

"Start!" Chen Mengchuan's calm voice fell.

In the take-off square, the spaceship Tianzhi 1 in the middle slowly emitted a lot of light, red, blue, purple and green.

"Wow...... ......"Some dull loud noises trembled several times, and the huge Tianzhi 1 slowly pulled out a little gravitational support from various areas of the fuselage, and then the light bloomed.

The sound of "buzzing ......" goes from slow to fast, and finally joins into a continuous sound line.

Tianzhi 1 slowly and finally slowly levitated with the continuous help of the gravitational node!

With the levitation of Tianzhi 1 taking off, everyone couldn't help cheering, regardless of country, race, or color, all those who saw this scene came to deeply bless the spacecraft of Tianzhi Technology!

After a slight flow of dust, Tianzhi 1 slowly flew into the sky, and its speed began to accelerate little by little at a speed that was recognizable to the naked eye.

Without the grandeur of other rockets when they took off, Tianzhi-1 just flew steadily straight towards the sky.

In the sky under the blue sky and white clouds, Tianzhi 1 steadily broke through the air, rushed out of the clouds, and went towards the blue sky faster and faster.

The picture was quickly switched to an altitude of 3,000 meters, and dozens of Tianzhi Technology's little white dragon gravitational mecha were suspended in the airflow, meticulously transmitting the picture of Tianzhi 1 flying back to the ground......

Soon after, Zhao Wanyu started the camera and video camera on Tianzhi 1, and the picture switched to the outside of Tianzhi 1 again, in the video screen, it can be seen that Tianzhi 1 is constantly flying towards the sky with a very fast acceleration, piercing through layers of white clouds, and then, finally, only a piece of white remains.

In Tianzhi 1, Xu Zhenglin's hand was under the cover of the gravitational mecha, holding the hand of his wife Zhang Ying tightly, and the two could clearly feel that Tianzhi 1 was taking off, and at the same time, the indoor anti-gravity system also began to start little by little, alleviating many adverse reactions caused by the rapid vertical flight of the two.

These reactions are well known to them when they are trained, and they have experienced them many times, and they are not unfamiliar. But this time, when I really sat in Tianzhi 1, under the gaze of all mankind, I felt completely different, and these pressures came from myself, not the gravitational effect.

"Lao Zhang, how do you feel?" Xu Zhenglin asked his wife.

"It's okay, a little nervous, a little stressed, I felt a little out of breath at first, but now it shouldn't be a big problem." Zhang Ying smiled hard.

"Lao Xu, Lao Zhang is about to enter the troposphere." A voice came out.

It was a subsystem of Tomoko Kawa who spoke, the artificial intelligence "Ayu" of the spaceship of Tianzhi-1.

"Okay, Ayu, thank you." Zhang Ying tried to calm herself down.

"After entering the troposphere, the temperature outside the spacecraft will start to cool down continuously, and the spacecraft will turn on the heating and heating system, and there will be some stuffy effects, which are normal." Ayu continued to say slowly.

"Okay, Ayu." Lao Xu nodded in the mecha.

On the ground, after the take-off ceremony, several experts from Tianzhi Technology began to positively introduce and explain the situation that Tianzhi 1 will face next, and at the same time, the video screen began to cut a lot, and it was given to the manned inner warehouse of Tianzhi 1.

In the inner warehouse, two mechs sat hand in hand, with a safety net buckle next to them to protect their bodies.

"Into the troposphere!" Chen Mengchuan looked at the video screen and spoke slowly.

Zhao Wanyu nodded, with a lot of knowledge, she is now very aware of the troposphere, which is the closest layer of the atmosphere to the ground, with an average altitude of about 10 kilometers.

The height of the troposphere varies with latitude, with a maximum of about 15 km at the equator and a minimum of about 8 km at the poles. The area where Sioux is located is relatively middle, about 11-12 kilometers.

The troposphere is the region with the most atmospheric convection and is where most weather phenomena occur. 80% of the water vapor in the Earth's atmosphere is deposited in the troposphere, so it is also the most frequent area for evaporation, clouds, rain, etc. On average, tropospheric temperature decreases with altitude, with a decrease of about 0.6°C for every 100 meters of ascent. So after entering the troposphere, the temperature will start to drop very quickly.

Toni looked at the video screen, pushed his glasses and said slowly: "After officially entering the troposphere, for every 1 kilometer of altitude rise, the temperature exposed to the outer body of Tianzhi 1 will drop by about 6.49 degrees Celsius on average, and from the first law of thermodynamics, this decrease in temperature is caused by the emergence of adiabatic cooling." When the air rises, the air pressure drops and the air expands. In order for the air to expand, it needs to be applied to the surrounding area, so the temperature will drop. ”

The crowd nodded. The flight speed is now very fast, reaching a speed of more than 100 kilometers per hour, and it is still accelerating, and it is expected to be in the troposphere in 4 minutes.

The video director began to switch the lens to the external camera.

As can be seen from the external camera of Tianzhi-1, the fuselage has begun to tremble significantly slightly, which is obviously caused by the collision effect of the airflow, and the multi-directional gravitational system of Tianzhi-1 has also been fully turned on, constantly adjusting the flight trajectory quickly and slightly, so that the fuselage is on the correct trajectory and does not produce orbital offset.

In the process of introduction, the director switched the video screen to the external camera several times, and from the constant trembling, all the people who paid attention couldn't help but feel a little anxious, for fear that Tianzhi 1 would be washed off the track by the air flow in this troposphere.

A few minutes have passed in a flash, and the speed of Tianzhi 1 has increased to 170 kilometers per hour, and the artificial intelligence Ayu has prompted that it has passed through the troposphere and reached the stratosphere!

"When the temperature in the outer area is -57.15 °C, it is expected to start to enter the temperature recovery zone after 6 minutes, the stratospheric airflow is basically horizontal airflow, and there is very little convection up and down. Ayu continued to prompt.