Nine years ago, the first class started today, and I couldn't stop again after that ...

June 20, 2013,

Shenzhou 10 manned spacecraft Wang Yaping

At the Tiangong No. 1 Space Station

With the assistance of Nie Haisheng and Zhang Xiaoguang

For the first time in my country, "space lectures",

The "space teaching" lasted 50 minutes.

More than 60 million students in 80,000 middle schools across the country,

And audience sitting in front of the TV

Live through CCTV,

Watch this magical "space teaching".

This class,

Light up the curiosity of many children,

Light up the aerospace dream of countless children.

Since then,

"Tiangong Class" began to become

China's popularization of scientific knowledge

A major national brand.

With the successful launch of the sky and the core cabin,

China Tiangong Space Station enters the stage of rail construction,

"Tiangong Class" becomes active,

The class will be held twice in December 2021 and March 2022.

Three astronauts of Shenzhou 13 multiplied group

Gorgeous turning into a scientific class teacher who follows good,

I demonstrated a batch to the global audiences above the nine days

Carefully designed scientific experiments,

And reveal the scientific principles behind.

Take your children to review these three lessons together ~

Bleak

June 20, 2013

The first "space teaching"

On June 20, 2013, CCTV conducted a live broadcast of "Space Lecture" for the first time. The host and experts completed the related topics of "space teaching" in the studio, and connected the Beijing Flying Control Center and the National People's Congress through the video live broadcast. Affiliated to the ground classroom.

At 10:05 am, the astronaut Wang Yaping opened this magical "space teaching" in Tiangong No. 1.

Space Single Brew Experiment

On the ground, a small ball on the bracket is tied to a small ball to form a single leap system. After pulling the small ball and letting go, the small ball began to swing back. The exercise cycle is related to the length and gravity acceleration of the thin rope. In the end, the small ball stopped swinging under the action of air resistance. However, there is no gravity effect in space. After pulling up the ball, the ball will stop at the original position without swinging; if you push the ball with your hand, give a small ball a smaller initial speed, and the ball can be around The bracket shaft is peripheral. On the ground, if you do not give a small ball a very large initial speed, it is difficult for small balls to perform circular motion.

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Space Singles Experiment (Picture Source: CCTV)

Space gyro experiment

High -speed rotating gyro rotation shaft directions remain unchanged in inertial space. In space, touched high -speed rotating gyro and static gyro with your hands. Although high -speed rotating gyro will produce slight shaking, the axis of the rotation axis remains unchanged, and the static gyroscope will roll. It can be seen that the fixed axis characteristics of high -speed rotating gyro are exactly the same as the ground and the ground, so the spacecraft can use the gyroscope to target space.

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Space Gyro Experiment (Picture Source: CCTV)

Space Water Mask, Water Gel Experiment

It is called liquid surface tension on the surface of the liquid surface and reduces the surface area of ​​the liquid. The water film formed after the metal ring is inserted into the water bottle will not be broken. Paste the "Chinese knot" on the surface of the water film, and the water film is still intact. This is the result of the surface tension characteristics of the liquid surface in space loss.

Inject water into the water film, the water film quickly turned into a crystal clear water ball. Such a perfect spherical shape can only exist in a micro -gravity environment, because the surface tension of liquid on the ground is difficult to compete with the impact of the gravity of the earth, and the water ball will inevitably change.

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Space Water Mask and Water Gel Experiment (Picture Source: CCTV)

The whole class will review for the first time

December 9, 2021

Taught again after 8 years!

On December 9, 2021, Zhai Zhigang, Wang Yaping, and Ye Guangfu of Shenzhou 13 took the second "space teaching" at the China Space Station.

This "space teaching" activity is carried out in the interactive method of heaven and earth, setting up ground main classrooms in the China Science and Technology Museum, and setting ground classrooms in Nanning, Sichuan Wenchuan, Hong Kong, and Macau in Guangxi.

Buoyancy disappearance experiment

On the ground, the table tennis is put into the water and will float to the water. So do the same experimental table tennis in space "floating"?

The answer is: not floating!

Watch the video and understand the reason

This experiment shows the phenomenon of buoyancy and gravity accompaniment. The buoyancy comes from the pressure difference between the liquid caused by gravity in different depth. When the gravity disappears, the interior of the liquid is the same, and the buoyancy disappears. However, the surface of the earth is difficult to disappear, and this experiment is difficult to display intuitively. Under the micro -gravity conditions of the space station, the accompanying relationship between buoyancy and gravity can be clearly appeared.

Po Teng Film Experiment

After the pornographic tablet encounters water, there will generally be a lot of bubbles. So what will happen to when you meet with water balls in space?

The answer is: become a happy "bubble ball"

And the fragrance

In the ground environment, throw the foam tablet into the water ball, and you can see the bubbles float up. In the heavy environment of the Chinese space station, because the buoyancy disappears, the foaming tablets are thrown into the water. The bubbles are no longer floating, but they are squeezed with each other. In the end, a very interesting look will be formed. This water ball will also be supported by the bubbles, and you can see the effect of the water glorious expansion.

Water film experiment

In the water film experiment, Wang Yaping put the flowers made by her and her daughter on the earth into the water film, and the beautiful flowers bloomed instantly.

Come and witness this magical moment

Water Globe Optical Experiment

Wang Yaping injected water into the water film, and he got a water ball, and then injected a bubble into the water ball. The magical scene appeared: through the water ball and the bubbles, you can see two statues.

How is this going?

When a astronauts enter a bubbles into the water ball, because the buoyancy in space has disappeared, the bubbles will not float upwards, but they stay in the water ball honestly In the middle, the water ball is so bubbled into two In the middle, there is air in the middle and water around the bubbles. At this time, the entire water ball became two lenses, and the outer circle became a convex lens, so there was an inverted image. The inner ring was equivalent to the combination of two concave lenses. At this time Essence Therefore, you can see the two statues that are poured at the same time in the water ball.

Space cytology research experiment display

On the "Tiangong Class", the astronaut Ye Guangfu showed everyone that the research and development of cell growth and development under weight loss.

The myocardial cells observed under the microscope of the fluorescent microscope, the flashes and flashes beating

March 23, 2022

The third "space teaching"

The third lecture was officially held on the afternoon of March 23. The Shenzhou -thirteen astorates Zhai Zhigang, Wang Yaping, and Ye Guangfu were given "space teaching" at the China Space Station. Each space experiment, full of dry goods, come to review with the editor ~ Space "Ice and Snow" experiment

In the "Four Seasons Like Spring", Wang Yaping produced a crystal clear "ice hockey" -the liquid ball crystallization. The appearance is like "ice hockey". What is the principle behind? Poke videos

On the ground, the use of saturated liquid crystals is a way to separate and purify solid substances.

Excessive saturated solutions refer to solutions with concentration exceeding the theoretical balance concentration, and excess solutions will precipitate crystals. Through filtering, washing, drying, etc., you can extract higher solid substances with higher purity.

Excessive saturated solution is an unstable state that is easy to crystallize when it is disturbed by external factors. Crystals are affected by many factors, such as temperature, pressure, shear force, ultrasound, external magnetic fields, etc. The process of crystallization is to first form crystal nucleus under the influence of external factors, and the crystal nucleus gradually grows up to complete the crystallization process.

In the "Tiangong Class", Teacher Wang Yaping had squeezed the saturated solution in the previous two times, and the crystallization phenomenon occurred in the tube also showed the instability of the overrive solution, and the pressure brought by the squeezing induced the crystals.

Demonstration experiment of liquid bridge

In the ground gravity environment, the surface tension of the water is insignificant, so how strong is the surface tension of liquid under the micro -gravity environment of space? Watch the astronauts with a liquid to take a bridge

The surface tension of the liquid is on the surface of the liquid to reduce the surface area of ​​the liquid. The liquid has surface tension, especially under the effect of weightlessness, the surface tension will "show great power."

The surface tension makes the surface of the liquid equivalent to the existence of a "elastic thin film" and restraint the liquid movement. Its essence is that there is a thin layer in the surface where the liquid is in contact with the gas, called the surface layer. The molecule in the surface layer is sparse than the internal liquid. The distance between the molecules is larger than the inside of the liquid. For example, when pulling the spring, the spring shows a trend of contraction.

Water and oil separate experimental grounds, water and oil are naturally stratified after mixing, and oil is under the water. So in the space station, will water and oil be layered naturally?

The answer is: No.

Watch the video and understand the reason

In the same volume, the density of water is greater than oil, and the quality of water is greater. According to the directional formula F = MRW2, when the angle speed W and the radius R are the same, the mass M is large, and the greater the centripetal force required for water droplets, that is, the more the equivalent centrifugal force is, so the more water is thrown to the bottom of the bottle. Water and oil are layered.

Space parabolic experiment

In the space parabolic experiment, a special teaching assistant came: ice pier! Throw the ice pier in space, will it fall down like the ground?

I know

Throwing objects on the ground, because it has been affected by the gravity of vertical downward, analyzes its movement trajectory, mainly depends on what direction is thrown along:

When throwing the speed in the vertical direction, whether the upper or lower throwing is a linear transmission;

When the speed of throwing the object is no longer in the vertical direction, whether it is tightly throwed or thrown horizontally, the movement of the object is a curve transmission.

In space, because in the space station cabin, the objects are almost unpopular. No matter which direction, it can almost be regarded as a uniform straight movement, because the object is only affected by the weak air resistance, the speed direction and size changes are all changes. Very small.

This lesson will continue!

Xiaobian learned at the Shenzhou No. 14 manned flight mission press conference on June 4th that during the period of Shenzhou 14, it will fully complete Basic configuration space stations are built to build a national space laboratory. The Shenzhou No. 14 Flying Passenger Group will use the air gate in the test compartment for the first time to implement two to three out -of -the cabin activities, and will continue to carry out Tiangong Class.

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