[Log time (urgent): 20.21.54 9/5 18.]

Signal type: gravitational wave

Code: GW180509 (International Common Naming Standard: GW is the abbreviation of gravitational wave, 18, 05, and 09 represent year, month, and day, respectively)

Frequency: 32 (Hz)

Probe source: G00

Info: AAAA warning, dormant state dismissed, message sent in D4 mode, relay star: 'Golden Crow'

Note: I have entered the search status by myself.

……】

When the message was sent back by 'Lihuo', it was already 20:24, only 8 minutes had passed since 'Robin Hood' detonated, and the connection between the two could be keenly discovered by counting the delay of a little more than 3 minutes in one direction from Mars to Earth, as well as the time it took to process the information.

The information was transmitted at the speed of light, and through unknown means, the "unknown" on Mars detected a nuclear explosion on the moon, and then immediately sent a gravitational wave signal to the outside world.

It is a medium-wave signal, with a transmit power of no more than 100 kilowatts, which is difficult to detect with a rough detector 'away from fire', but it is too close, almost close at hand.

Although it was not deciphered, it was still able to judge that this was definitely a smart signal from the highly regular waveform changes, which directly triggered the sub-top 4A level warning, and automatically woke up and issued an alarm.

The time for the gravitational waves to appear lasted only a short 0.5 seconds, but they were all faithfully recorded and sent to Earth by 'Leaving the Fire'.

Although it is theoretically possible for the remaining gravitational-wave observatories to receive the information, the base is definitely the fastest and most informed, and it is not even ruled out that it is the only one, because the difficulty of detecting gravitational waves is too high.

A big reason why gravitational wave detection is difficult is that it is too difficult to emit high-power gravitational waves, and only about 200 watts of gravitational wave power can be generated by orbiting the sun with the mass of the earth, and Jupiter is only 5,000 watts, and the period is still calculated in years, so it is impossible to observe at all.

Therefore, when Einstein predicted gravitational waves, he also believed that humans would never be able to detect gravitational waves because they were so faint.

The first discovery of gravitational waves was the GW150914 discovered by LIGO, which was formed by the merger of two black holes with a mass of 36 and 29 solar masses, with a relative velocity of more than 0.6 times the speed of light at impact, and the mass of a single black hole formed by the merger was about 62 times the mass of the sun.

That is, about three times the mass of the Sun is converted into gravitational waves in just one second, with a peak power of 50 times the total external power of all stars in the entire visible universe.

And such powerful gravitational waves only caused LIGO's 4-kilometer arm to move a proton in diameter of 1/10,000, equivalent to 1/625 trillion of a hair.

Because of this, GW180509 could never have formed naturally, and Mars simply could not produce gravitational waves of this power.

Of course GW150914 there are 6 to 1.8 billion light-years from Earth, and the attenuation of GW180509 is certainly far less exaggerated, so there is a possibility that Earth can also be detected.

But in general...... Half and half chances, anyway, "Shanhai" has already controlled the communication of several observatories and personnel, and nothing has been discovered for the time being.

And that's not its job, now the Star-3 computer is going all out to try to crack the GW180509.

Lu Qun still didn't care about being shocked, and tried to analyze the law of GW180509.

Compared to the misunderstanding of the Aramco M incident, this is the real alien encryption.

For such a completely unfamiliar encryption, it requires the joint efforts of a group of sociologists, biologists, linguists, etc., but fortunately, the base has attracted some talents for cosmic sociology, and it is also on the way.

"No, I can't help it."

Lu Qun put down his pen and shook his head slightly, there was already a lot of manuscript paper in front of him, which was full of various calculation notes.

"I've tried several simple encryption routines, and I've tried most of the base systems, but they don't work, and I still hope that professionals can have some results, but I think the content of this gravitational wave transmission shouldn't be complicated."

The gravitational waves, which lasted only 0.5 seconds in total, were really short, and it would be hard to make absolute conclusions if it weren't for the fact that the waveform had several obviously complex patterns and were launched from Mars.

"Let's stop the 'mountains and seas', we don't even know the encryption method, and there is no answer for a lifetime by relying on the existing exhaustive tricks, so it is better to wait for the quantum computer to be more reliable.

We don't know anything about extraterrestrial civilizations, and it's unrealistic to try to decipher the content with just one signal, unless we receive a particularly large number of signals. ”

Hearing him say this, the group of base executives standing behind them couldn't help but sigh.

Ye Changsi had expected it, and he just tried to find Lu Qun.

"It's okay, that's normal...... While we can't hack it, we should at least know why it happened. ”

GW180509 occurred almost at the same time as the 'Robin Hood' explosion, and it is clearly inseparable.

But if the nuclear bomb will trigger gravitational waves, even if it has not been detected before, why did the Toshima hydrogen bomb in December not be triggered, and the 'fire' was already on Mars at that time.

Several people quickly looked for a breakthrough point, and quickly summed up two differences:

The equivalent, this explosion yield of 1.55 million tons, is larger than the previous three times, and may just reach the threshold for triggering the alert;

This is the first time that human beings have detonated a nuclear bomb completely away from the earth and the atmosphere, which is also quite special and worthy of key study.

And then there are the questions:

Why send gravitational waves, just because of a nuclear bomb or something else, on what basis?

How does the Martian 'launcher' detect a nuclear explosion nearly 60 million kilometers away?

Who built the 'launcher' and for what purpose?

To whom do the gravitational waves send, and are there aliens in the solar system?

"First of all, the message of the explosion of the hydrogen bomb is conveyed at the speed of light."

Seryov was the first to speak:

"We can basically assume that Mars sends information immediately after detecting the explosion of the hydrogen bomb, with negligible delay in between, which indicates that there are long-term active and listening stations on Mars, so they can react immediately.

The second point, in fact, I think the most important thing to focus on is why it is the moon, whether 'it' only focuses on the moon or as long as there is a reaction outside the earth.

The Moon must have a special place in this matter, and we happen to have the ability to explore the Moon at depth, and if I can, I would recommend a few more nuclear tests, which of course is very risky. ”

"No way!"

Shookada almost immediately rejected Seryov's final proposal:

"Everything needs to be thought of at the worst, we can no longer continue to stimulate extraterrestrial civilizations, this is playing with fire.

Come to think of it, they may have been monitoring for a long, long time, and if it was triggered for the first time, it must have met certain conditions, and I don't think it would be a good thing for the farmers to come over after the sheep have fattened. ”

"Think about how you react when you learn that a kid has a knife in his hand?"

Xiao Okada, who is in charge of deep space exploration, has spent a lot of time studying extraterrestrial civilizations, and has often interacted with those philosophers and biologists raised by the base, and his overall thinking is inclined to extremes.

"We think about everything from the most basic and simple point of view: what can the 'monitoring station' on Mars know?

Obviously, it is unlikely that it will know that there is a person named Xiao Okada who is talking about it here, but it must know that humanity has a hydrogen bomb, and the message must be this.

The hydrogen bomb is like a knife, although it is not worth mentioning compared to the advanced weapons of mankind, but as long as someone holds it, there is a threat, and all civilizations must put their own safety first, otherwise why send a signal at this time?

This is a civilization that has mastered the technology of gravitational wave communication, and it does not know how long ago it put the 'monitoring station' here, and how far has it developed now? ”

"Then what should I do, can I only shrink my head into the shell of a turtle that does not exist and wait for death?"

Perhaps because of his own extraordinary experience, Seryov was a little dissatisfied with his pessimism:

"We are not ordinary human beings, and sooner or later we will have to do this, but now it is only a year or two in advance.

On the contrary, we should have sent astronauts to land in advance and find out what was there, and that was a real gravitational-wave communication antenna! ”

Seeing that the atmosphere between the two was a little wrong, Ye Changsi interrupted them in time and returned to the topic:

"It's not the point of how to deal with it, the focus should be on what the signal is transmitting, whether the purpose of monitoring us is good, and most importantly, how far away our civilization is from us, and whether there are other alien civilizations in the universe."

The existence of extraterrestrial civilizations is one thing that GW180509 absolutely confirms, so it stands to reason that there is more than one extraterrestrial civilization.

Gravitational waves travel at the speed of light and spread throughout the universe without blind spots, which is equivalent to cosmic broadcasting.

Based on human observations of the surrounding galaxies, no traces of civilization have been found in at least 100 light-years of human activity, and no communication signals have been detected.

GW180509 can be seen at a glance that it is regular, without any camouflage at all, and even the signal sent by the 'fire from the fire' is disguised as a natural signal, so why is GW180509 so bold?

Isn't it worried about using it recklessly because the signal reveals its existence?

Moreover, from the perspective of communication, neutrino communication that can be transmitted directionally, has strong penetration, and has high information density is more in line with non-faster-than-light interstellar communication means.

Of course, in any case, the most important concern for humanity should be where its receiver is.

Since it travels at the speed of light, even if the signal flies out of the solar system, it will take 1 year, it will take 4 years to fly to the nearest galaxy α Centauri, and it will take 20 years for some promising planets, such as Glazer 581, and hundreds of thousands of years later.

The spiral arm of Orion, where the solar system is located, is very remote, and it is too far away to live in a place where there may be an extraterrestrial civilization.

If the alien civilization is ready to destroy the earth, it will organize a light-speed fleet to set off from the moment it receives the signal, and it is likely that hundreds of years have passed when it arrives.

As for faster-than-light travel, this point can be omitted, a civilization that has not even mastered non-delayed communication cannot have the technology to achieve faster-than-light travel.

So if the alien crisis comes in tens or hundreds of years, with the speed of the base's development, it may be able to whip the little green men in turn.

On the other hand, if the receiving end is not tens or hundreds of light years away, and there happens to be a huge alien fleet flying silently a few light years away, it will fly over immediately after receiving the information.

Although this may be so small that it is almost non-existent, even aliens have appeared, what can be absolutely disbelieved?

What kind of attitude to treat aliens and how long to set a safe time will directly determine the base's response strategy.

"At least 20 light-years, right?"

After listening to the question described by Ye Changsi, Seryov thought about it and answered:

"I don't know much about extraterrestrial galaxies, but at least galaxies within 20 light-years should be free of extraterrestrial civilizations, otherwise the supertelescope would definitely be able to find something.

In addition, they chose gravitational wave communication, which is characterized by reduced attenuation and wide diffusion, which shows that the receiving end is still relatively far, otherwise there should be a better way.

Once back and forth, there will be at least thirty years of peace, and if there is a station that can interfere with the solar system in a very close place, at least there is a trace, right? ”

"Not necessarily, who says they have to organize a huge fleet from a distant home planet or a military fortress?"

Xiao Okada once again denied:

"You probably haven't read "The Three-Body Problem", which is a science fiction book of the new century, and there is a concept in it that I think is worth learning: weakness is not the original sin of survival, arrogance is.

Maybe they just need to put an antimatter cannon in a deserted place, activate it and launch an antimatter bomb, not to mention the humans, the sun will bury us for us.

As for such a thing as Starfleet, maybe the real cosmic civilization doesn't need it at all. ”

Xiao Okada's words are all implying that Seryov is an old antique from the last century, but it is reflected that Ye Changsi is also a contemporary, so it is much more obscure.

After they finished speaking, a voice rang out:

"Maybe there's another breakthrough."

Yang Zhongkai didn't know when he appeared here, he had just gotten off the plane, and the clothes on his body were all messily covered.

He began to systematically study extraterrestrial civilizations half a year ago, but soon reached a dead end, and it was basically a fantasy to continue.

GW180509 shook him a lot, but more of a thrill.

Hearing his voice, everyone stopped to look at him.

"There's another place, Titan, and Titan must be valuable!

The known alien ruins in the solar system are not only Mars, but also how small is it that one solar system is visited by two alien civilizations at the same time? Almost zero!

Even if there is, there must be a great correlation between these two places, one Mars may not find the answer, but the two places can argue with each other, and besides, we haven't gone to either yet.

It won't take a few years to explore them, and even if it's urgent, I'm afraid there will be some time, right? ”

He turned his burning gaze to Ye Changsi again:

"President Ye, technically, no one of you can replace it, but these things need the brains of sociologists and philosophers."

(End of chapter)