Is it true that Apollo 20 discovered Chang e and Moon Village and a 500 meter high and 4,000 met

It must be fake, if only then the ducks could fly!!

There is no launch base on the moon, how did Apollo return to Earth?

This may be the doubt in the hearts of many friends, after all, the huge launch frame of the Saturn V rocket that launched the Apollo lunar spacecraft is obvious to all, so when Apollo returned from the moon, there was no such launch tower to use, how did it take off and return from the moon?

1. Why is the Saturn V that launched the Apollo spacecraft so big?

Ordinary spacecraft rockets sent to low earth orbit do not need such huge launch rockets, which they do, because they only need to reach low earth orbit and back! So how was the Apollo moon landing spacecraft structured?

A complete Apollo spacecraft is composed of four parts, namely the service module, the command module and the upper and lower stages of the lunar module, if it is only orbiting around the earth, then only one command module is needed, but this is to the moon, back and forth plus the time of lunar activities takes more than ten days, and a total of four parts of the total mass of more than 40 tons, under the conditions at that time, only the huge thrust rocket of Saturn V can successfully send the Apollo spacecraft into the orbit around the moon!

2. What is the part of the spacecraft returning from the lunar surface?

The picture above shows the upper and lower structure of the lunar module, the two parts are independent, but they are connected together when descending, because the lower part used to cushion the landing during the descent, and the ascent stage is to take off directly from the descent stage when returning! The entire lunar module is about 14-15 tons in total, but it is clear that the ascent will not bring back all this mass! Another important statistic is:

Earth's orbital speed: kilometers and seconds.

The orbital speed of the Moon: kilometers and seconds.

It is clear that the Moon is easier to orbit than the Earth, so why not escape velocity? Because the ascent stage of the lunar spacecraft only needs to dock with the command module in orbit, it is the command module that really returns to the earth, the lunar module is abandoned in the lunar orbit, and the service module is also abandoned in the earth's orbit when it finally reaches the earth!

Therefore, compared with the total mass of more than 40 tons when launched, it is less than 10 tons when taking off from the moon, and the gravitational force of the moon is relatively small, and the thrust requirements of the take-off rocket are low!

3. How did the ascent stage of the lunar module take off?

The return stage of Chang'e-5 is also of the same structure, and the base of the descent stage is used as a launch pad! Regardless of whether the take-off from the lunar surface is successful or unsuccessful, this descent stage completes its mission after landing, and serving as a launch pad is its residual value!

The gravitational pull of the moon is relatively low, and it is not as large as the gravitational pull of the earth, so it does not require a lot of speed to fly on the moon, the Apollo spacecraft is composed of two parts, the lower half can give the upper half of the power needed to fly, and only the upper half returns to the earth.

The Apollo spacecraft actually has a launch pad, and the Apollo spacecraft is divided into an upper section and a lower section, and the lower section is the launch pad of the Apollo spacecraft. Because the Moon orbits at a speed of only kilometers per second, it does not require as much fuel or power as it does to orbit the Earth. In addition, not all of the Apollo spacecraft returned to Earth, only a part of the command module returned to Earth.

This is because the Apollo spacecraft used the second half as a launch pad, igniting fuel to generate power and pushing the first half back to Earth.

The original Apollo spacecraft used the lower half of its own section as a launch pad, and then flew back to Earth, and left the lower half of itself on the moon, which will eventually become the existence of space junk.

Why on the Moon, unlike on Earth, launch bases have to use launch towers to launch rockets? This is because the gravitational pull of the Moon is only 1 6 of that of the Earth, and the same emitted mass only needs 1 6 of force to achieve the same acceleration. At the same time, the rocket does not need to carry much propellant to the point of becoming huge.

For the same load, the mass of the rocket was reduced not only to the original 1 6. There are complex calculation formulas, which will not be discussed here. In summary, the forces experienced by the launcher are greatly reduced, so only a simple launcher is needed to take off on the lunar surface.