There are so many planets in the vast universe that there are about 60 billion terrestrial planets in our galaxy and 1 billion of the livable planets. If it's life at 1/10000 probability, it will also be a huge number. It's only in our galaxy. There are countless galaxies in the universe like ours. So the aliens exist. (Xiao Bian's personal idea doesn't mean all), but the universe is too vast for us to touch. The speed of light limits our distance. So we haven't been looking for aliens.
Although we have not found extraterrestrial life to this day, there are frequent events on the planet UFO on earth. Many people believe that aliens are far more advanced than our technology, even ahead of millions of years, and they have already visited the earth.
There are many events in the UFO event that can't be explained, but many of them are forgery. However, there are also UFO cases that have not been solved until now, such as the Roseville incident in the US, the air blame car event in Guiyang, the Mantell UFO incident and so on. But those are true or false.
Some of UFO, paranormal books or websites, often appear all sorts of rumors about the aliens. Although these rumors are widely spread, they can not change the essence of low-grade rumours.
The common image of aliens is the big eyes, big heads and thin bodies in the picture. Such an image is false, which is entirely human imagination. Just like people in ancient times think of God, the image of God is imagined in the way of human beings. All kinds of images of aliens are imagined by earth people according to the appearance of creatures on the earth.
Some people say they encountered the aliens, and depicts the hit off the alien image is the image of the common. Such "encounter" is either nonsense or mental illusions.
In scientific inquiry, it is not necessary to assume that there is a need for aliens to exist, just as there is no need to assume the existence of God. Human exploration of the universe is not a direct purpose for searching for aliens, but more for the purpose of exploring truth in the service of mankind. Even if we find information from aliens in the process of exploring the universe, though it's a sensation, the process of discovery can only be very accidental and very outdoors. The interest of aliens in the group of scientists is much lower than that of ordinary people.
Around the base, we can often find some globular, triangular and frisbee like UFOs. There are photos and some video evidence to prove these phenomena. In the summer of 1986, residents of two towns near Rachel and white end could feel the ground shaking at their feet. The local residents could see some strange phenomena at 7 o'clock every Thursday morning. People can also hear the strange sound coming from the base. But when people propose to prosecute the army of the base, everything will disappear and return to its original form.
There is a very mysterious ~ green house!
Speculation, "may include not only the alien wreckage in the green room" there may be aliens take the spacecraft debris, the spacecraft crashed in 1947. (explain, this is what I mentioned above. What did they shoot down that year? That's for sure. Even if it wasn't the alien spacecraft, it also shot down something and was saved and covered up).
Finally, I learned from a lot of information that UFO should be sure to exist! Just maybe there are many reasons, can only use the secretive ways to let the world know that, because the truth of what happened to be covered up, it must have reason to hide.
If you are very curious, you can pay more attention to the videos and photos posted by NASA. Maybe you can be more sure that the earth is not lonely. What has been there? Maybe there!
Whether it exists or not, it also depends on the fact that you do not believe in the evidence, and this mysterious thing, so far, has been a mystery.
The above answer is purely personal, and the content that is seen on the Internet is only for discussion. It doesn't have any meaning.
I hope to help you.