Seven Wonders of Flying Dreams: China has dreamed of flying for thousands of years, and entrusted it to Chang 'e last month. Every Mid-Autumn Festival, I look up and dance in space. The four wonders of the East are the red: the true grit in China rings, the rockets roar and shake everywhere. Open the way in one step, Dongfanghong, space teenager.
relevant knowledge
Space flight, also known as space flight, space flight, space flight or space flight, refers to various activities of entering, exploring, developing and utilizing space (that is, space outside the earth's atmosphere, also known as outer space) and celestial bodies outside the earth.
Space activities include space technology (also called space technology), space application and space science. Space technology refers to a comprehensive engineering technology that provides technical means and guarantee conditions for space activities. Space application refers to various application technologies in scientific research, national economy, national defense construction, culture and education by using space technology and its developed space resources.
Space resources refer to all kinds of environment, energy and material resources that can be developed and utilized by human beings outside the earth's atmosphere, such as high and remote positions in space, high vacuum, ultra-low temperature, strong radiation, microgravity environment, solar energy and material resources of celestial bodies outside the earth.
High Life
The cosmic environment is extremely harsh, and the main factors harmful to human body are high vacuum, high hypoxia, cosmic radiation, temperature difference and so on. These unfavorable factors will cause serious harm to the human body. In this environment, astronauts cannot live and work.
Facing the severe space environment, how to ensure the life safety of astronauts? Our scientists and technicians have developed a closed environment that is basically isolated from the outside world, that is, a closed cockpit, to protect astronauts.
One is in the morning and the other is in the evening. People's long-term living habit is to "work at sunrise and rest at sunset", and sleep is usually arranged at night. The day and night cycle of spacecraft in space flight is different from our day and night cycle on earth. A day on earth is sunset and sunrise, which is set to 24 hours.
A sunset and a sunrise in space flight have different periods, because it is related to the orbit of spacecraft around the earth. High orbit and long day and night cycle; When the orbit is low, the cycle of day and night is short. During the spacecraft's space flight, the period of day and night is inconsistent, with long daytime and short nighttime.
90 minutes is a cycle of day and night, and the longest night is only 37 minutes. When a spaceship enters the dark side from the front of the earth, it is like entering dusk and night from day. The space shuttle is very fast. When the sun comes out, it jumps out like thunder, and when it goes down, it disappears like a whirlwind.