How did the rocket fly up and down?

The best answer: spacecraft return is to apply the principle of orbital transformation, and force the spacecraft to break away from its original orbit and re-enter the earth’s atmosphere to realize return, that is, to return by direct entry method. According to this method, the spacecraft returning to the ground from the outer layer 空 must go through four stages: de-orbit, transition, reentry and landing.

Spacecraft return is the application of the principle of orbital transformation, forcing the spacecraft to break away from its original orbit and re-enter the Earth’s atmosphere to achieve return, that is, to return by direct entry method. According to this method, the spacecraft returning to the ground from the outer layer 空 must go through four stages: de-orbit, transition, reentry and landing.

For spacecraft operating in low Earth orbit, the simplest way to return is to make use of the weak resistance of the thin atmosphere in the upper earth to naturally lower the orbit of the spacecraft, and then enter the dense atmosphere to realize the return, that is, the so-called orbital decay return or braking ellipse return.

Although this method is simple to return, it is difficult to predict the landing time and position, and it requires a long braking time. Therefore, this method is only used as a standby emergency return plan in the early stage of manned space flight, when the forced return of spacecraft cannot be realized in case of failure.

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