中国神舟十五号飞船成功着陆，在地面工作人员的协助下，航天员挨个被抬出着陆舱。面对镜头，航天员费俊龙说：“回家了！首先向祖国人民报告，我们神舟十五号飞行乘组，完成了在轨所有的工作和任务，现在顺利回到了祖国，我们感觉良好！”【中英双语阅读·高二难度】

为什么宇航员是被抬出来的？

宇航员被抬出太空舱后无法立即行走，是因为人类在低重力环境中的身体适应能力比较弱。太空飞行中，由于缺乏重力刺激，宇航员的骨骼、肌肉、心血管和平衡器官等都会发生不同程度的损失或萎缩。所以当他们返回地球时，需要逐步恢复身体的适应性，此过程可能需要几天或数周时间，才能完全适应地球的重力环境。

为什么美国登月过程没有出现类似现象?

随着中国网民的教育水平的不断提升，精通物理的中国网民开始提出疑问：

月球也是有重力环境，从太空的无重力环境，到月球的有重力环境，为什么当年美国宇航员登陆月球的时候，没有出现肌肉无力无法站立的现象，反而活蹦乱跳的呢？这是不是美国登月造假的又一个证据？

反驳观点一：美国登月期间，宇航员在轨时间比较短，可能不会出现肌肉无力无法站立的现象。

这个观点立马有人反驳：当年杨利伟在轨飞行仅仅21小时23分，着陆后仍然是被地面工作人员抬出来的。而美国宇航员从地球飞行到月球，耗时3天，这个时间长度足以出现无法行走的现象。

反驳观点二：宇航员可能在月球登陆了以后，休息了一段时间，才出舱活动。

网友立马反驳：根据史料记载，阿波罗11号在格林威治时间7月20日20时17分在月球着陆，21日2时56分阿姆斯特朗就走出登月舱，休整时间仅仅6个半小时。而航天员进入重力环境以后，最快也需要几天时间才能正常行走活动，不合理。

此前中国一项发现也指向美国可能假登月

早些时候，中国科学院物理研究所通过对嫦娥五号月壤样品展开分析，发现了不同起源的天然玻璃纤维。其中一种类型的玻璃纤维，是月球表面的硅酸盐在陨石撞击中形成的。美国登月标记的登陆地点均位于一个巨大的陨石撞击坑，但是在美国提供的月壤样本中却没有这种玻璃纤维。在美国以往的月壤论文中，也没有提及。

美国登月到底是真的还是假的呢？

英文版：Shenzhou 15 successfully landed, and the astronaut being carried out of the spacecraft provoked reflection: the U.S. moon landing may have been faked.

The Chinese spacecraft Shenzhou 15 has successfully landed. With the assistance of ground personnel, the taikonauts were carried out one by one from the landing module. Facing the camera, taikonaut Fei Junlong said: "We're home! First of all, we report to the Chinese people that our Shenzhou 15 flight crew has completed all the tasks and missions in orbit, and now we have returned to our country smoothly. We feel great!"

Why were the astronauts carried out?

After being carried out of the spacecraft, astronauts are unable to walk immediately because human adaptation to low-gravity environments is relatively weak. During spaceflight, due to a lack of gravitational stimuli, astronauts experience varying degrees of loss or atrophy in their bones, muscles, cardiovascular systems, and balance organs. Therefore, when they return to Earth, they need to gradually restore their adaptability, which may take days or weeks to fully adapt to Earth's gravitational environment.

Why didn't the US encounter similar issues during the process of landing on the moon?

With the continuous improvement of education level among Chinese netizens, Chinese netizens who are proficient in physics have begun to raise questions:

The moon also has a gravitational environment. Why didn't the American astronauts experience muscle weakness and inability to stand when they landed on the moon, considering the transition from the weightless environment of space to the gravity environment of the moon? Is this another piece of evidence that the US faked its landing on the moon?

One refutation is that during the US lunar mission, the astronauts spent a relatively short time in orbit, so they may not have experienced muscle weakness and inability to stand.

This point was immediately refuted by someone else: Taikonaut Yang Liwei only spent 21 hours and 23 minutes in orbit and had to be carried out by ground personnel after landing. On the other hand, the American astronauts took three days to fly from Earth to the moon, which is long enough to cause inability to walk.

Refutation two: The astronauts may have rested for a period of time after landing on the moon before exiting the spacecraft to move around.

A netizen immediately refutes this by pointing out that according to historical records, Apollo 11 landed on the moon at 20:17 GMT on July 20th, and Armstrong walked out of the lunar module at 02:56 on July 21st, with only a rest period of 6 and a half hours. It is unreasonable to assume that astronauts would need several days to be able to walk and move around in a gravity environment.

Previously, a Chinese discovery also pointed to the possibility of the US faking its moon landing.

Earlier, through analysis of lunar soil samples collected by Chang'e-5, the Institute of Physics at the Chinese Academy of Sciences discovered naturally occurring glass fibers of different origins. One type of glass fiber was formed from silicates on the surface of the moon during meteorite impacts. The landing sites of the American moon missions were all located within a large meteorite impact crater, but this type of glass fiber was not found in the lunar soil samples provided by the US and was not mentioned in their published papers on lunar soil.

So, was the US moon landing real or fake?