People living in cities today always like to go camping in the surrounding areas during holidays and enjoy the bright starry sky without the influence of light pollution in groups of two or three.
Of course, some people are intoxicated by the beautiful scenery of twinkling stars, while others are thinking about whether these twinkling stars have any other use besides emitting .
Camping to watch the stars
Previously, scientists had discovered that more than a hundred stars had "disappeared" . The whole process was very strange, so they suspected that alien civilizations had "stole" these stars and made them their own " Contribute energyā .
So, are these stars really gone? Is there any scientific basis for the above statement?
Scientists have discovered that stars "mysteriously disappear"
Human beings always lament that their life span is too short and will die before they can fully experience everything in the world. Therefore, they envy those stars that are always twinkling in the night sky, thinking that they are "Eternal" , but is it really so?
The twinkling starry sky
In fact, those shining stars will also have their moments of death. For example, our sun may move from young adulthood to old age after billions of years, and then undergo a long evolution. Finally finished his life.
However, the period of stellar evolution is at least measured in hundreds of millions of years. Therefore, based on human lifespan and the length of civilization, it is impossible to see stars die, let alone see them all at the same time. More than a hundred stars died.
The evolution of stars
The opportunity to discover the disappearance of stars was the observation and research of Lupus by American astronomers in the middle of the last century.
At that time, they took photos of the starry sky, and decades later, when scientists took photos again, they found that many of the stars had disappeared.
Jackal
In 2017, the project "Sources of Disappearance and Appearance during a Century of Observations" about finding missing stars was officially launched. looks for similar missing stars by comparing past observation data. The final results showed that more than a hundred stars had mysteriously "disappeared". As for the reason for the disappearance of
, no conclusion has been reached yet. But according to the time span of the "star death" conjecture we mentioned earlier, the disappearance of should have nothing to do with death.
A related new study led by Beatriz Villarroel of Stockholm University and the Instituto de AstrofĆsicade Canarias in Spain explains: "Unless a star directly collapses into a black hole, there is no known physical process for its disappearance."
Weirdness in Observations Disappeared Stars
Of course, in addition to believing that stars collapsed into black holes , there are also many scientists who believe that the disappearance of stars should be related to alien civilizations . It is believed that the disappeared stars should be enslaved by high-tech alien civilizations and are "glowing and heating" in their galaxies.
The " Dyson sphere " of alien civilization has been launched?
First of all, letās briefly introduce some Dyson ball and what is.
In 1959, American physicist Freeman Dyson mentioned in his paper that alien civilization may be much more advanced than human civilization. Therefore, according to human standards for measuring civilization levels, alien civilization should be able to develop more stellar resources.
So the Dyson sphere is actually a huge artificial structure that wraps a star. In this way, people can utilize most of the energy of the star and avoid "waste".
Freeman Dyson
Of course, over the years, many people have put forward various ideas about the structure of the Dyson sphere. Some think that the stars should be surrounded by dense satellites, while others think that they may be more advanced artificial celestial bodies. .
If you can make the stars in your own galaxy into Dyson spheres, then technology will inevitably advance further under this influence.
When the energy of a single star can no longer meet the needs of alien civilizations, they will "requisition" other stars. Like the more than one hundred stars that mysteriously "disappeared" during our observations, they may be the unlucky that was taken away.
The idea of āāa Dyson sphere
It should be noted that the "disappearance" of mentioned by scientists does not mean that has completely disappeared, but that has become dimmed and has become dim in just a few decades, and many of them have even faded out of sight. . The changes of
obviously do not conform to the rules of , so some scientists say that they may be dragged and squeezed by the "alien's Dyson sphere", becoming weaker and weaker in the process.
The brightness of each star in the Hertz-Rubber diagram
However, regarding this point, Martin Lopez Corredoira, the scientist of the research project, believes that the disappearance of stars has nothing to do with extraterrestrial civilization, because from the current observations, does not No signs of any extraterrestrial civilization activities were found nearby, so they are more willing to believe that this is a natural phenomenon.
Beatriz Villarroel commented: "Discovering a truly lost star or a star that appeared from nowhere would be a valuable discovery and would also include the new astrophysics we know today. It is this The phenomenon that we cannot explain well later gave birth to many great theories and discoveries.ā
There are no signs of alien activities nearby
To sum up, there is currently no scientific basis to prove that the disappearance of stars is alien. The handwriting of a star. As for the Dyson sphere imagination, although it is indeed consistent in some aspects, fundamentally speaking, there is still no supporting evidence.
It is worth mentioning that if it is far-fetched to connect the disappearance of stars with the activation of Dyson spheres by alien civilizations, then another discovery of scientists is closer to the "Dyson sphere" , which is the change of star KIC 8462852.
Various "forms" of Dyson spheres
The discovery of sudden drops in star brightness
The star named KIC 8462852 is a full 1,400 light years from the earth, which can be said to be very far away. But because its light is so obvious, it has always been the focus of scientists' attention.
However, scientists have discovered some unique characteristics of this star during long-term observations. It turns out that it will "flicker" every once in a while. This flicker refers to the change in brightness .
KIC 8462852
Logically speaking, changes in the brightness of a star are mainly caused by the planets orbiting it, but no matter how influential it is, it will not directly reduce the brightness of the star by 20%. Therefore, the scientific community has launched a discussion on this issue.
Moving planets will affect the brightness of stars
Some scientists believe that this weird flickering may be due to the large number of comet fragments nearby, which is caused by a natural phenomenon. However, some scientists believe that the sudden drop in star brightness should not be a natural phenomenon, but caused by "man-made" . This person is naturally an alien civilization.
Comet
Later, in order to understand the basic situation of this distant star, SETI Research Institute used Allen Telescope Array to observe it, but no narrowband or broadband signals were obtained. In this case, it is determined that there should be no so-called alien civilization near the location of .
Of course, if we want to fully understand why KIC 8462852 causes to flash abnormally and to appear, we may have to wait until we get closer. Moreover, there is no conclusion as to whether the "Dyson sphere" of alien civilization is really exactly the same as human imagination.
Related signal monitoring records
Regarding the problem of finding Dyson spheres, many scientists believe that we should focus on smaller celestial bodies because the investment in building a Dyson sphere is very large. If the star is too large, it may not be built before it can be built. Before the end, the raw materials are exhausted.
Dyson spheres should choose small stars
"Dyson spheres" may appear on small stars
Although everyone knows that larger stars emit more energy, such as the famous giant stars in the universe Scuti UY and Stephen 2- If 18 could be wrapped by a Dyson sphere, its energy utilization rate should be several times higher than that of the sun.
But "imagination is beautiful, reality is very skinny" , because if you want to wrap a star, you need not only enough distance, but also a lot of materials . Scientists have previously speculated that if we want to create a Dyson sphere near the sun, even if we dismantle Jupiter and Mars, it will not be enough. The amount of building materials required is beyond imagination.
Jupiter
In this case, it will be easier for to transform some stars that have entered their "twilight years" into Dyson spheres, such as white dwarf stars . This kind of product of the tacit evolution of low-mass stars has a high density but a small volume.
A white dwarf star with a mass similar to that of the sun should be about the same size as the earth. Although its light and heat are very weak, the construction level of is easier than , so it is the first choice of for "junior Dyson sphere".
These researchers calculated the mass required to build a 1-meter-thick Dyson sphere in the habitable zone of a white dwarf. The result was about 1023 kilograms, slightly less than the mass of the moon. In addition, researchers calculated that a Dyson sphere surrounding a white dwarf could produce gravity similar to that on Earth.
white dwarf
Therefore, we should expand the search scope in the process of looking for Dyson spheres. We should not only focus on some larger-mass stars, but also pay attention to those low-mass stars that appear to be dim.
