Tiangong classroom teacher: Hello, everyone, welcome to Tiangong classroom! I am a teacher in the Tiangong classroom, and I am very happy to explore the mysteries of space with you.

Student A: Teacher, what's space like?

Tiangong classroom teacher: Space is an infinite space without air and gravity. In space, astronauts need spaceships and spacesuits to survive and work. The space environment is very special, and there are many things we don't know yet, which is one of the reasons why we started the Tiangong class.

Student B: How do astronauts live in space?

Tiangong classroom teacher: astronauts need to rely on the life support system in the spacecraft to provide necessities such as oxygen, water and food in space. They also need special exercises to prevent muscle atrophy and osteoporosis under weightlessness. In addition, astronauts also need to face many challenges, such as psychological pressure and loneliness.

Student C: Teacher, I also want to be an astronaut. What should I do?

Tiangong classroom teacher: If you want to be an astronaut, you need to have solid scientific knowledge, especially in mathematics, physics and astronomy. At the same time, you also need to have excellent physical and psychological qualities to adapt to the special requirements of the space environment. Finally, you need to pass strict selection and training to become a qualified astronaut.

Participants in the dialogue in Tiangong classroom:

1, Tiangong classroom teachers: Tiangong classroom teachers are usually experts or astronauts with rich space knowledge and experience. They are responsible for teaching in space, explaining space knowledge to students and answering their questions.

2. Teachers in the ground class: Teachers in the ground class are generally teachers with rich teaching experience. They are responsible for the teaching of the ground class and cooperate with the teachers of the Tiangong class to explain the space knowledge to the students.

3. Students: Students are one of the main participants in the Tiangong class. They can listen to the teacher's lectures in the ground class or through the live webcast, learn space knowledge, and also ask questions to the teacher in the Tiangong class.

4. Aerospace engineers and scientists: Aerospace engineers and scientists are one of the important participants in the Tiangong class. They are responsible for providing technical support and professional knowledge to the teachers in Tiangong classroom and assisting them to teach in space.

5. Media reporters: Media reporters are also one of the participants in the Tiangong class. They are responsible for reporting the teaching process and achievements of the Tiangong classroom and spreading space knowledge to more people.

6. Volkswagen: Volkswagen is also one of the participants in the Tiangong class. They can learn about the teaching process and achievements of Tiangong class and know about space knowledge through live webcasts or media reports.