China, 2041.

In the spring of Jinling Castle, cherry blossoms are in full bloom. There is nothing to do in the spring, just to be busy with flowers. Looking up, the cherry blossoms in front of you are like snow and clouds, and the cherry blossoms in the middle of the road have a sudden, full of brilliant visual impact, which is reflected in the heart, which is a shock.

The 30-story gray-walled office building stands in Qixia District, which is the [Blue Light Base]. In the more than 20 years since the launch of the [Blu-ray Project], there has not been much significant change in the tracking of UFOs, but it has greatly led the development of science and technology. Hao Qiuyan knows very well that the universe imagined by human beings has limitations, and the exploration of the unknown world is by no means an overnight thing.

The solar system is at the edge of the Milky Way, and the density of stars around it is much lower than that of the galactic center, so half of the Earth's surface is always in darkness at any given time; This allows human beings to appreciate the infinite charm of the mysterious, vast and romantic cosmic space since the day of their birth. As a result, the dream of leaping into the void was born, and this dream that lingered for thousands of years led mankind to bravely step into space, and countries with space capabilities have successively established scientific research bases on the moon and Mars.

The universe is not desolate, the universe is not empty, the universe is full of life! Human beings on Earth have always used their own way of thinking to think about the definition of civilization in the whole universe, but in fact, we don't know anything, not even what we are.

When night falls, looking into the depths of the endless night sky, those dots like fire and stars, inexplicable feelings arise spontaneously. In the vast galaxy, there are 100 billion stars, how many intelligent life exist in it, and what is the purpose of coming to the earth for these highly developed intelligent life? This topic accompanies Hao Qiuyan's work and life, how to unravel the fog?

In the vast universe, the civilization established by human beings on earth is insignificant; The civilization created is only 10,000 years old (which can be investigated), the development of high-level science and technology is only a few hundred years, the deep space exploration and space technology are only a few decades, and compared with the astronomical figures of those universes, the human civilization on the earth this season is also short-lived.

We know that planets themselves do not emit light and can only reflect light from stars, so they differ greatly in brightness. If you compare a star to a bright searchlight, the planet can only be counted as a firefly at best, or a firefly flying around the shade of a searchlight. Thus, the possibility of an extraterrestrial civilization landing on a planet is akin to the light of a searchlight from afar, to determine where anyone can make a wrong judgment without knowing the truth; Perhaps they have a special ability to make the right decisions when the situation is unclear. Of course, this is only a vertigo plot and cannot be used as a practical consideration.

According to telescope technology, if we find life on exoplanets, then it means that "big filters" are likely to appear in our future; Because there is a certain probability of the birth of life, if this limiting factor is not in the birth stage of life, then it is possible that at a certain period of civilization development, whether it is our civilization or extraterrestrial civilization, will face this bottleneck.

"The stars are all dots, and the complex structure of various civilizations and societies in the universe, the chaos and random factors in them, are filtered out by such a huge distance. Those civilizations seem to us to be points with parameters, which is mathematically easier to deal with. ”

——Liu Cixin, "Three-Body Problem II: Dark Forest"

The latest telescopes are so sensitive that astronomers could theoretically use them to observe signs of activity in "high-level extraterrestrial civilizations," either from harnessing the waste heat generated by harnessing the energy of the stars within the galaxy.

"Kardashov Index", Type I civilizations can control the use of the planet's energy, and can migrate and settle within the local star system. The human race on Earth is only about 0.7, and it has not yet reached this level. Type II civilizations can control and use the resources of the star system in which they are located, and can achieve sub-light or superluminal speed, and carry out interstellar and galactic travel. Type III civilizations can control and use the energy of their own galaxy (Milky Way) and have footprints all over (Milky Way). Type IV civilizations, capable of harnessing and controlling the energy of their own galaxy (Milky Way) or galaxy clusters. and the V.-type civilization that controls the universe in which it lives. Levels III., IV, and V., with the current means of human beings, do not observe the slightest sign of existence.

Hao Qiuyan knew that no matter how advanced the observation equipment was, those high-dimensional spaces would not be able to observe it. In a sense, those advanced alien technologies and intelligence are completely crushing the human beings on the earth in all directions. But if a civilization that can calculate the distance of light years comes to the earth, its technology or civilization is so advanced that it is better than our earthlings. He is not satisfied with the current progress in UFO exploration and tracking, and only quantum communication is still in its infancy. There are some high-energy weapons sporadically, but in terms of technical links such as launching, they are still controlled by radio and electronics, and alien technology can be completely suppressed. But there is no way, even if the earth's technology has achieved unprecedented development, it is still crushed without suspense. Midi was snatched away by a UFO, prompting the country to start the [Blue Light Project].

Retrieving over and over again, as the mind spreads out, UFO events are like a chain, interlocking together. In a way, it's a more internalized fear; UFO, USO, has always been intricate, some connections in the open and in the dark, to be found, to be interpreted:

With the success of the first atomic bombing, an era of crisis began. While the human world has gained infinite momentum, it is also facing destruction on a larger scale. Extraterrestrial life is monitoring everything about humanity more closely, hovering over the location of warehouses at nuclear weapons or nuclear-driven rocket launch sites. "If there is no house thief, you can't attract foreign ghosts", this is the truth.

It was a declassified event, and the press conference to decipher the inside story of UFOs was spearheaded by former U.S. Air Force Colonel Robert Salas, a U.S. military-era ICBM launch officer during the Cold War. Salas experienced first-hand an accident in 1967 when a UFO visited the U.S. military base in Malmström, Montana. At that time, an oval-shaped flying object with a red glow appeared over the military base, as a result of which almost all the missile launch systems at the military base failed.

The most legendary is the "Lendelsham Forest Incident", known as the Roswell Incident in the United Kingdom. Two air bases leased by the United States in the UK, Base Bentwaters and Base Woodbridge. On the night of December 25, 1980, between Christmas and New Year's Day, three consecutive nights of amusement. The unidentified object that landed sent a beam of light towards the storage area of the nuclear weapon, and on the last night of Christmas, the most sensational thing happened. The U.S. Air Force at the base was gathered in an open space near the base, where they witnessed the appearance of UFOs and a red light moved towards them. The light suddenly becomes intense, piercing the retinas of witnesses, and an object appears in the clearing. Although you can't look at it directly, you can roughly judge its shape. They saw three lifeforms, which looked translucent, almost like ghosts. They floated in the bright light, their limbs hard to see; It can be about 4 feet tall, has the same skull structure, large black eyes, and almost no nose, but can see a little outline of the mouth. Wearing a tight-fitting uniform, about a foot off the ground. When these creatures appeared, the humans were watching them, and they were watching the humans. There was no exchange of items, no formal communication, and then vanished, feeling like a flying saucer back inside. The saucer vibrated slightly, then rose up, 'whoosh', and within seconds it was the size of a star.

There have been countless UFO sightings around the world, and it turns out that the scientific community's perception of UFOs is gradually changing; In January 2010, the Royal Society, the world's most prestigious scientific organization, convened a two-day symposium entitled "The Detection of Extraterrestrial Life and the Scientific and Social Consequences, which was discussed by astronomers, sociologists, theologians and social scientists, with the participation of the United Nations." Including NASA, the European Space Agency, some of the world's best scientific minds came together to study the topic. This is not out of nowhere, on Earth, on the Moon, on Mars, UFOs are frequently discovered. As the commander-in-chief of China's extraterrestrial observations, he can have a clear understanding.

The mysterious USO often haunts the vast oceans of the earth, and these unidentified diving objects have caused the two superpowers to spend a lot of financial and material resources on fruitless tracking and exploration for a long time.

In March 1963, U.S. submarines were training 160 kilometers off Puerto Rico as planned; Suddenly, a submarine deviated from course and found an unidentified object under the water at a speed of at least 150 knots and a diving depth of 6,100 meters. UFOs can be seen hovering in the air, but the Navy can never see the shape of the diving object underwater, and it is impossible to determine what exactly they are detecting.

On November 11, 1972, the Norwegian Navy discovered a submarine-like USO in the Sognefjord on the west coast, and has been tracking it for nearly two weeks, and the Norwegian Navy sent a surface fleet and several anti-submarine helicopters to track unidentified diving objects. Finally, on November 20, 1972, its traces were discovered, and one of the submarines fired at it, and the navy blocked the entire Sognefjord. However, half a month later, USO disappeared.

In the last century, Soviet submarines in the 1972 century detected huge moving objects in very deep waters in the Atlantic Ocean, which emitted a special sound, similar to the croaking of frogs.

British physicist and mathematician Stephen William Hawking believes that if aliens attack the earth, the main purpose is to plunder the earth's resources.

The "alien threat theory" is a popular view in the current academic circles and folks, however, some scientists disagree with this statement; They used the psychological effects of human beings on aliens, and even the intelligence and technology of aliens, to show that aliens do not pose a threat to earthlings.

Professor Zhou Haizhong, a well-known Chinese scholar, once wrote, "It is completely unnecessary to worry about the alien threat, because as long as it is a high-level intelligent life, their reason determines that they must treat other intelligent life forms in a measured manner; In the future, aliens and earthlings will be able to coexist peacefully, cooperate amicably, and develop together. ”

Carl Edward Sagan, an American astronomer and science fiction writer, said, "Our contact with aliens is probably nothing more than a reaction to our backwardness, a manifestation of our uneasy conscience that we have historically ravaged us who are slightly more backward than we are." ”

Seth Shostark, a senior astronomer and doctor of astronomy at SETI in the United States, agrees. It is also a logical idea to think that aliens may do these things, after all, space travel requires a lot of manpower, material resources, and financial resources. An extraterrestrial civilization with enough technology to conduct interstellar navigation will likewise develop more advanced robots. Wishing to explore the Earth, they are more likely to send robots than to go out themselves. While the connection between humans and aliens became a staple of McDevitt's numerous science fiction writings, he didn't think it could happen. He noted that it would take quite a long time for aliens to reach Earth, and that any extraterrestrial civilization with such capabilities would not want to use force. We have more to worry about than we do about alien invasions.

Jill Tate, an American astrobiologist and institute for the search for extraterrestrial civilizations, refutes the idea of alien evil; She said Sir Stephen William Hawking had warned that aliens were aggressive and would do whatever it took to conquer Earth and turn the home on which humanity depended into a colony. If aliens have the ability to come to Earth, it means that they have very advanced technology, which means that they don't need slaves, food, or other planets at all. If aliens do come to Earth, the purpose is simple, just to explore. Given the age of the universe, we may not be the first creatures to encounter visitors from across the sky. The history of mankind is the history of ideas. The concept of science is mapped to the dark age, some concepts we embrace rationally, and some concepts we blindly accept. We live for ideas, and we die for ideas; We kill each other in order to promote certain ideas, some of which have been lost in the annals of history, and some of which have become a kind of dogma of people. The history of mankind is also the history of nations, and the history of ideologies, as well as the history of territories, and the history of struggles between nations. But every moment in human history, from the Stone Age to the Information Age, from the Sumerian civilization to the Babylonian civilization to today's entertainment star gossip, it all happened in one place; Every book, every poem, every smile you see, every cry you hear, is happening on Earth.

Human scientists, who have analyzed UFO events on Earth, hold two views. What are the connections between these bewildering UFO incidents? With so much extraterrestrial life having an impact on humans on Earth, who is a passerby? Who's waiting? And when will it take for the countries of the world to be immersed in the enemy, carry out nuclear deterrence, and unite as one?