The earliest countdown program appeared in a sci-fi movie called the Goddess Chang'e flying to the moon, which was initiated by the director Flantz Ken. Later, after research, experts believe that this countdown launch process is very scientific. Concise, clear and accurate, it highlights the gradual reduction of rocket launch preparation time, which can make people concentrate their thoughts and produce a sense of urgency that the preparation time is coming to an end and the launch is about to begin. Since then, the four-sequence countdown shooting range has been widely used. This can also be regarded as an artist's contribution to science.
A rocket is like a huge cannon. When people ignite its fuel, it will generate upward thrust and push the spacecraft into the sky. If a rocket
No, it's just a multi-level firepower to push it into the sky in stages.
All the planes we take rely on the heavy power of the air to "hold" in the air. In space, it can't fly without air. You need a space shuttle to fly in space.
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