I have a little black hole

But to think about it, Lei Tiantang still didn't really do it. On the one hand, he was afraid of dirtying his hands, on the other hand, he knew that these short-term brain movements were not very dangerous in a short time.

Humans emit so many radio signals, is the location of the earth exposed?The very real problem is that we want to be exposed, but our strength does not allow us to be exposed!

Even if the radio is used to transmit signals for less than a hundred years, it means that the radio signal only travels a distance of 100 light years. Compared to the vast universe, 100 light years is too limited!

And this is only a theoretical analysis. In fact, the radio signals used by humans are difficult to fly so far, and the signal strength will gradually weaken during the propagation process, so that it is difficult to identify them in the end!

Imagine the types of signals that human beings can detect today. Basically, they are the signals of massive objects with abnormal activity, and they propagate outward in the form of high-energy cosmic rays!

For example, a supernova explosion generates more energy at the moment of the explosion than the total energy of the Sun in life. Even with such a high-energy signal, humans only detect it!

Compared to cosmic energy, the energy of radio signals emitted by humans is too weak!Similar to neutron star collision, pulsar etc.!

Therefore, even if there is an alien civilization, it is difficult to receive the signal sent by humans, because the signal is too weak, even if it is received, it is likely to be filtered out, and will not attract the attention of aliens!

From the results of our human exploration using various detection methods, we can find possible habitable planets (terrestrial planets within the habitable zone) within 50 light-years from the sun. There are now about 10 known.

Within a radius of about 100 light years, we can roughly think that the number is 4 times, that is to say, there are about 40 planets that are likely to have life, plus those that have not been discovered, should be less than 100.

We know very little about these planets, but anyone with a little scientific common sense knows that the conditions for life to appear on a planet are very harsh, especially for complex life. If life on our planet is not good luck, it may have long been After several annihilation disasters, let alone we want to give birth to human beings!

Therefore, most of them are likely to have no life for various reasons. Even if there is life, the probability of developing intelligent life and even civilization is extremely low, so we are still generally safe.

"Haha! Tell me what those people are doing! To be honest, I will not worry about the situation of the aliens in a short time. I am not a fool who thinks that the earth is the center of the universe!

The location of our planet is too biased, and the surrounding galaxies are scarce. If such a few galaxies can produce several extraterrestrial life, then the universe will be too casual!

If this is the case, the aisles on our planet will not be safe and stable, and now no alien civilization has discovered it!"Lei Tiantang said with a smile.

As we all know that we live in the spiral galaxy, the Milky Way is actually a barred spiral galaxy, which means that our galaxy may have two main spiral arms, plus a central bar, which the astronomers know very little about.But in such a vast spiral arm structure, where is our solar system located?

The Milky Way is about 100,000 light-years wide. We are about 25,000 light-years away from the center of the Milky Way. It seems that we are not in the two main arms of the Milky Way, but in a small arm in the Milky Way.The spiral arm we are in is the Orion arm, also known as the Orion arm, which is located between the galaxy's arm and the fairy arm.

Our Orion arm is 3,500 light-years wide and about 10,000 light-years long.Our Sun, Earth, and all other planets of the solar system are within the Orion's arm.Our position is close to the inner edge of the swing arm (focus, edge!), about half the length of the swing arm.

The Orion arm is also aliased, sometimes called the Orion-Swan arm, which is named after Orion, which is one of the most prominent constellations in winter in the northern hemisphere (summer in the southern hemisphere).

Some of the brightest stars and the most famous objects in the constellation (Bandi IV, Bundi Seven, Orion Star Belt, and Orion Nebula) are neighbors of the Sun, also located in the Orion arm.This is why we can observe so many bright objects in Orion.

The size of the earth is only one-third of one-thirty millionth of the sun, and our sun is just a very common star in the Milky Way. There are hundreds of billions of stars like the sun in the Milky Way.

The diameter of the Milky Way is hundreds of thousands of light years!For humans, the size of the Milky Way is unimaginable, but humans have discovered billions of extragalactic galaxies as large as the Milky Way!

"Yeah! But even so, I'm very unhappy about their behavior. What if something unexpected happens, such as a fleet of advanced civilizations passing by near our solar system?

Originally, people might not pay attention to a small asteroid in our remote rural area during the voyage, but the signals emitted by these dead guys were received by them. Such a thing is of course in the long cosmic journey. It is a very interesting thing!

At that time, how did we change how to deal with these alien fleets of interest?Did those people kneel on the ground and call their father to let go?"Kuafu is still very unhappy with this kind of thing.

"So that's why I'm so desperately developing space technology. It's not a good habit to wait and die. Since the boss has the chance, I should take advantage of it.

Otherwise, in the event of a doomsday scene, even if I can save some human beings, but the earth as a home is gone, it doesn’t really change like the wandering civilization that science fiction says!

This is also a reason why Tian Mingli said they would build a large scientific instrument such as the Hadron Collider. I don’t hesitate to agree. Although high-energy physics research does not see a harvest in a short time, I am still very optimistic about its future. of.

Anti-matter, dark matter, dark energy, and even the fur of space research can also be studied with such equipment, and these things can be used as energy or weapons!

Especially for weapons, I can say with certainty that the time it takes to make weapons is much faster than the time it takes to become an energy source. This is what our nuclear energy is now!

I think that when we have mastered anti-matter bombs, dark matter bombs and even space demolition bombs, the threat of ordinary aliens to us is very small!"Lei Tiantang said with a smile.