央视网消息：神舟十九号三名航天员4月30日就将返回地球。回家的这一路是如何经历重重难关的？通过增强现实技术一起了解神舟 十九号返回的全过程。 首先，神舟十九号撤离空间站节点舱前向端口，先后在19米、200米停泊点停泊。此后，神舟十九号飞船逐渐远离空间站，并完成 180度的掉头，变成正飞的姿态，也就是从推进舱在前变成轨道舱在前。 这次神舟十九号返回依然采取"快速返回方案"，绕飞地球的圈数从早先的11圈缩短到了5圈，用时7个半小时。大幅缩短了航天员返 程的时间，也减轻了航天员在狭小的返回舱内长时间停留的不适感。 经过5圈的准备和等待后，最后的冲刺阶段就开始了。在大约50分钟时间里，返回舱将从大约390公里的高度回到地面。这一路，返 回舱要穿越重重难关，这期间有四组关键动作。 第一组，两次调姿、轨返分离。这组动作在大约390公里的高度完成。先是一次调姿，飞船水平方向旋转90度。 轨返分离之后，紧接着就是飞船二次调姿，继续在水平方向旋转90度，变成推进舱在前，返回舱在后，也就是倒着飞，而且推进舱 还会翘起来，有一个俯仰角，为制动减速，进入返回轨道做准备。 一次调姿到位，马上就是轨返分离，也就是轨道舱和返回舱之间分离。 ...

Core Points - The Shenzhou-20 manned spacecraft was successfully launched on April 24, 2023, at 17:17, from the Jiuquan Satellite Launch Center, marking a significant achievement in China's manned spaceflight program [1][3] - This mission is the fifth manned flight in the application and development phase of China's manned space program and the 35th launch since the project's inception, with a total of 26 astronauts having completed missions in space [3] Launch Details - The Long March 2F rocket, weighing approximately 500 tons, was used for the launch, with 90% of its weight consisting of liquid fuel [4] - The rocket executed a program turn after 12 seconds of flight to save fuel, transitioning from vertical ascent to a trajectory aligned with the Earth's tilt [6] - The escape tower separated from the rocket at around 120 seconds, ensuring continued safety for the astronauts through high-altitude escape engines [8] - The rocket's boosters and first stage separated at approximately 152 seconds and 205 seconds, respectively, allowing the second stage to continue propelling the spacecraft [10][11] - The spacecraft successfully exited the dense atmosphere and entered its designated orbit after the fairing separation at around 13 minutes [13][15] Docking Process - Following the successful launch, the spacecraft will undergo a 6.5-hour rapid rendezvous and docking process with the space station, involving multiple orbital maneuvers [18] - The docking sequence includes a series of adjustments to align the spacecraft with the space station's core module, culminating in a final capture and locking mechanism [21] - After docking, a total of six astronauts will be present in the Chinese space station, facilitating a "space reunion" [22]