On this day, in the conference room of the Central Command Center of the Expeditionary Force Fleet, a group of senior commanders were gathering for a meeting. Pen ~ fun ~ pavilion www.biquge.info

"Is Tesla still hibernating?" Yuan Haochen asked with some surprise, "I remember that he has been absent from 23 high-level joint meetings in a row." ”

"Yes, he has been dormant with his wife for more than ten years." Deputy Commander of Science Lola replied.

"Good!" In this regard, Yuan Haochen did not say anything more.

"However, I have heard from the logistics department that according to Tesla's dormancy plan, it will be over in about half a year." Wang Yao, deputy commander of science, added.

Yuan Haochen nodded after hearing this, in addition to Tesla, during this high-level contact meeting, the senior officials who were dormant were military commander Sergei, and scientific commander Don Quixote.

The two of them are a little older, and they do have to sleep for a while longer, otherwise it will be difficult to make it to their destination and see the black hole Cygnus X-1 with their own eyes.

Subsequently, the commanders of various departments and different fields successively reported on the recent work and discussed some daily government affairs together.

In the second half of the agenda, a large blue star emerges in the center of the room.

Yuan Haochen took the lead and said, "Everyone, let's talk about your research results." ”

Suspended in the sky is a supergiant star, a high-luminosity blue variable star with a spectral classification of B1la+, and one of the brightest stars in the Milky Way.

As early as the age of the Earth, the Dutch astronomer and mathematician Willem Janszoon Blaeu (globe maker) had already observed the blue giant star in 1600. She was named Cygnus P (also known as Cygnus 34), and due to its stable nature, Cygnus P is also known as a permanent nova.

"Cygnus P is a very rare blue supergiant star, and her mass is very large, calculated to be at least 57 times the mass of the Sun, which is a little higher than the measurements made during the age of Earth. Her spectral type B1 or B2 indicates that it is a very hot blue supergiant with a surface temperature of about 19,000 degrees Celsius, and most of the radiation is in the ultraviolet band......"

Wang Yao, the deputy commander of science, introduced while controlling the computer, and the blue giant star suspended in the center of the conference room also changed.

In the universe, blue stars are hotter than the Sun or the Sun.

How do blue stars form?

How hot is a blue star?

According to Planck's law, the hottest stars should be dark purple, and the blue we can see should be the long-wave portion of these blue stars. In fact, the orange-red sun, the mother star of human civilization, is a relatively low star in the universe, and its temperature is relatively low among stars!

Blue intense stars are very hot! Their surface temperature is at least 35,000 degrees Celsius, so the radiation they emit is unusually violent.

"The total luminosity of Cygnus P has been calculated to be 660,000 times that of the star's sun, far exceeding that of most red supergiants. But because of her high surface temperature, her radius is much smaller than that of a red supergiant, about 71 times that of the sun and 78 times that of the sun. ”

Wang Yao continued to introduce that the simulated starry sky in the conference room also appeared at the same time, the star Sun, and the mother star of mankind, the Sun. Just standing next to Cygnus P, they look pitifully small.

Although Cygnus P is not a small blue star, it is far from the largest in the universe.

Human astronomers have observed a large number of extremely rare supermassive blue stars in the famous Andromeda galaxy M31. And in the center of many blue stars, there is also a supermassive black hole near the Andromeda spiral galaxy, which has a mass of about 100 million times the mass of the Sun.

(The Andromeda Galaxy is located about 2.5 million light-years from the Milky Way, making it a close neighbor of the Milky Way.)

"Have you guessed the age range of Cygnus P?" Yuan Haochen asked leisurely as he looked at the blue star in the center of the conference room.

"The latest calculations are basically the same as those of the Earth era." "Although Cygnus P is less than 10 million years old, due to her large mass (the bigger the star, the shorter her lifespan," Cygnus P has already evolved to the end of its life. Currently, she is losing her outer layer of matter at an alarming rate, and it is likely that in the future she will shrink and heat up into a Wolf-Raille star or explode directly into a supernova that will end her life in a heroic way. ”

Wolf–Rayetstar: The core of a massive star that is exposed by the loss of its shell in the form of a violent star wind during the hydrogen combustion phase. When they die, they collapse into Schwarzschild black holes. The abbreviation is WR star, is it not very familiar, the star WR-104 that destroyed the earth.

"So, isn't it very dangerous when we pass the star Cygnus P!?"

Deputy Military Commander Hallelujah asked. After General Sergei became dormant, he was put in charge of the actual navigation of the expeditionary fleet.

"Of course, there will be some risks, but according to estimates, even if Cygnus P has a supernova explosion, it will take at least a few million years." Wang Yao smiled and explained to Hallelujah.

"So, theoretically, a supernova explosion in Cygnus P will also affect the Sunrise Galaxy, right?" Hallelujah asked.

"It's theoretically possible, but the probability of posing a serious threat is extremely small."

Wang Yao operated the computer and simulated the energy diffusion model of Cygnus P after it evolved into a supernova on the star map, so that everyone could see it at a glance.

"Hallelujah, this is not the same as the star WR-104, the real cause of the destruction of the earth is a man-made disaster, not a natural disaster!"

This scene also reminded Yuan Haochen of the past conspiracy of the Tata civilization.

"Leader, are we really going to enter the P-Cygnus star system for scientific research?" Deputy Commander of Science Laura asked.

"Why not?" Yuan asked rhetorically, "A high-luminosity blue variable star like Cygnidis P is very rare. ”

Indeed, the expeditionary force passed hundreds of star systems along the way, and there was only this one giant blue star. Moreover, Cygnus P is a short-lived planet, and her nuclear fuel is consumed very quickly. Perhaps after shining for a million more years, she will most likely explode into a supernova.

Therefore, knowing more about Cygnus P in advance is also quite important for human civilization located in the Sunrise Galaxy.

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