Super Earth may not breed life, Dyson sphere may be able to search for traces of alien super civilization?

For a planet to harbor life, it must be within the habitable zone of its star system, the planet has stable liquid water, the planet has a magnetic field, and an atmosphere as a barrier to life ...... The best reference for humans looking for a planet suitable for the evolution of life is, of course, our home planet, the -Earth.

On July 23, 2015, NASA released the news that they had found a "super-Earth" - Kepler 452b - in the constellation Cygnus, about 1,400 light-years from Earth. Its mass is about five times that of Earth, its radius is 50% larger, and its surface gravity is about twice that of Earth. Kepler 452b is also in the habitable zone of its star system, with a theoretical surface of liquid water, a rotation period of 385 Earth days, and a lifetime 2 billion years older than Earth.

It is affectionately known as Earth's first cousin. Is there life on Kepler 452b? Because its distance from Earth is too far, astronomers speculate based on limited data, that Kepler 452b should have evolved to the end of the planet, it is more like the Venus of the solar system, runaway greenhouse effect led to the entire planet high temperature and pressure, like purgatory, even if the original existence of liquid water, has long evaporated. It is almost impossible for life to survive on Kepler 452b today.

These years we have discovered more than just Kepler 452b "super-Earth", there are also Gliese 667c, Kepler-442b, Kepler-438b, etc., their similarity index (ESI) with the Earth is similar to Kepler 452b, are close to 0.9. But no one dare to say that they are The first time I saw the Earth, I was able to see it.

Humans want to find an alien civilization in the vast universe of tens of billions of light years, but a long road, road is difficult. But if we think differently, we seem to be able to achieve the effect of the winding path. We no longer have to focus on planets that host life but are extremely difficult to detect. We can focus our attention on the stars that provide all the energy for life.

When an alien civilization advances to a certain point, its need for energy will increase greatly, and it will naturally turn to the stars that have been shining on them for hundreds of millions of years. Our sun sends energy to Earth every minute, which is equivalent to the heat produced by burning 400 million tons of coal. Yet the energy received by the Earth is only one part of two billion of the Sun's total radiation. If we could collect all the energy from the stars for our use, what other civilization would be worried about energy?

In the 1960s, British-American physicist Freeman Dyson came up with the idea for this advanced device - the Dyson Sphere. This is a giant spherical artificial object, the Dyson Sphere can wrap around a star and capture and convert all (most) of the energy produced by the fusion of the star. The Dyson Sphere is a logical necessity for a civilization with a long-term presence in the universe and a rising energy demand.

Admittedly, humanity is still too far away from deploying advanced Dyson spheres around the Sun. Our civilization level is only 0.73, not even a Type I planetary civilization. It is estimated that when a civilization reaches a Type 2 stellar civilization, it will be able to build Dyson Spheres. Dyson spheres would significantly intercept the light and heat emitted by stars, and the brightness of the stars would be significantly affected, so perhaps we can explore super civilizations in the vast universe based on this property.

In 2015, from the Kepler space telescope, which searches for exoplanets and stars, and its massive record of more than 200,000 stellar light transitions, a breakthrough was made when a "strange" star 1.5 times larger than the Sun was detected in Cygnus, about 1,480 light-years away from Earth --Tabbit (No. KIC 8462852).

The peculiar thing about this star is that its brightness and dimming change in a completely irregular way, beyond human perception. The brightness of Tabby's star often shows huge changes, with two drops of even 15% and 22%. The giant Jupiter in the solar system also shades out at most only 1% of the Sun's light. The light-change curve of Tabby's star is not only non-periodic but also asymmetrical.

At present, astronomers have made several more plausible explanations for Tabby's unusual luminosity variations in general.

First, irregular planetary remnants or nebular dust, surround Tabby's star, causing a dark cloud-like effect.

Second, planets with giant rings (e.g., Saturn's rings are hundreds of times larger), orbiting Tabby's star.

Third, the internal matter of Tabby's star or its shape. For example, sunspots appear from time to time on the surface of the Sun. Or, if Tabby's star is a rugby ball-like flat sphere, we observe its poles and equator, and of course, there are large differences in light and darkness.

When the above points are ruled out, the heaviest speculation comes, Tabby's star may also be due to super alien civilizations that have placed Dyson spheres around it, and when the Dyson spheres run to collect energy, they block the light and heat emitted by Tabby's star, so causing its irregular luminosity variation.

Now, astronomers have directed numerous observation devices to Tabby's star, and believe that the mystery of Tabby's brightness will soon be revealed.

--The last words, admittedly, the possibility that Tabby's star has changed its luminosity because of the Dyson sphere is very low, and even belongs to the category of science fiction. But it is always good to have a dream, who has not been in their ignorant childhood, with big eyes gazing at the sky full of stars, the vastness of the wandering full of fascination, your mind will not ring the humming song, "a twinkle bright, the sky is full of little stars ...... "