In response to Yi Feng's inquiry, Professor Luo Meng explained: "Because the spacecraft of the green light civilization has a non-zero initial take-off velocity. X, this unmanned spacecraft, probably in the form of an electromagnetic cannon, was launched from the main ship like a cannonball...... That's why it's flying so fast. ”

"The energy inside it, as well as the ion engine, is only used to reverse deceleration......"

Yu Yifeng calmed his head, made up the picture in his head, and understood.

Similarly, some aircraft carriers on Earth have a catapult. Using this ejection device, the carrier aircraft has a relatively high muzzle velocity before takeoff.

The electromagnetic cannon is a weapon that can be used in a wide range of ways, not only to fire artillery shells, but also to launch unmanned aircraft and the like. The electromagnetic cannon is also a research hotspot in the Noah, and the ion cannon and the Gauss cannon are essentially variants of the electromagnetic gun.

He wondered if it would be necessary to build a large electromagnetic cannon system that could launch both nuclear bombs and high-speed drones...... Just like in a green-light spaceship.

With new materials such as superconductivity and superalloys, coupled with scientific development in recent years, such a weapon system should be feasible, but the energy consumption is a little higher......

Professor Romon continued: "Captain, if you were to change direction, I think it would be possible to use a new ion engine to propel the Noah, which would be more effective and controllable than a nuclear bombing. ”

"However, because of the wonderful characteristics of Noah, plasma is also a mass substance, and if it is sprayed outward, it will reduce the speed of the spacecraft in vain......"

“…… Either the engine and the working fluid that needs to be sprayed can be transferred to the outside of the ship in advance. This is possible, but at the cost of a certain amount of speed. ”

Professor Romon pondered deeply, meditating on his own.

Changing the trajectory of the spaceship?

This incident reminded Yu Yifeng. According to the time experienced by humans, it has been a year and a half since people left the solar system, and counting the relativistic effect, it will take about seven or eight years for the outside world to pass!

Noah is moving at a near-speed of light at more than 0.98 times, which means that humans have been seven to eight light-years away from Mars!

Seven to eight light-years away, it's already very far from the sun. And after so long, the solar activity slowly weakened, and it was difficult for high-energy gamma rays to hit Noah.

He remembered a report from an astronomy conference a few years ago: the time is ripe for the use of gravitational-wave telescopes to determine the correct position of Noah!

Thinking of this, his heart suddenly became apprehensive.

This matter, after all, is still a big matter of life and death for everyone, and human beings always have to find a place to stay.

After discussing the new spacecraft with Xu Yunjin and others, Yu Yifeng immediately ran to the observatory and discussed with several astronomy experts for a while.

With their consent, he immediately ordered: start the detection program of the gravitational wave telescope!

Of course, this work takes several days to prepare...... I won't say much about the process.

Three days later, a large number of high-level government officials and scientists gathered at an astronomical observatory somewhere on the Noah.

Today is the day of the relaunch of the Gravitational Wave Telescope!

People gathered in twos and threes, discussing in whispers. The speed of their speech was slightly quick, and their expressions were slightly quick. Although the cultivation of these human elites is very good, they still can't hide the anxiety in their hearts from their behavior and expressions.

They...... Not optimistic about this detection!

The universe is really empty, and the distance between stars is incredible, and it is measured in light years at every turn, which is daunting.

If it weren't for the explosion of the sun, which gave Noah an incomparably powerful kinetic energy, no one would have thought that human beings would really be able to leave the solar system one day......

So far, even if human science and technology are booming, one year is worth the past twenty or thirty years, there is still not much power to interfere with the direction of Noah's movement.

This little bit is really only a little bit!

Everyone, including Yu Yifeng, in addition to resigning himself to fate, could only pray to the god of luck, hoping that there would be a planet that human beings could get on the path of Noah, and that human beings would have such good luck.

Although the probability of such a is very small......

However, such a small probability event determines various survival policies in the future!

If the observed planet is so far away from Noah's trajectory that human navigation technology would take thousands or even tens of thousands of years to fly, then ...... People must practice a more frugal life policy, practice family planning, and strictly control the population!

Even, we have to study large-scale hibernation chamber equipment! Reduce your resource consumption by hibernation en masse and survive the long voyage! The relevant hibernation chamber technology has been secretly developed for a long time, but it has not been known to the general public.

Well, humanity doesn't necessarily perish, but it's very troublesome...... Maybe you will die in the middle of hibernation if you encounter an emergency!

No one wants to go down this path!

Yu Yifeng is also very nervous at the moment, tens of thousands of years is too long, and the history of human beings has not been ten thousand years!

However, subjective will cannot change objective facts. Even if the ending is bad, people have to accept the facts, and if they can really only rely on hibernation, they can only go to hibernation.

The moment the gravitational wave telescope was turned on, his mind inexplicably calmed down, as if he had resigned himself to his fate.

A large series of numbers pulsate on the screen, which is the detection of the environment of the gravitational wave telescope and the correction of the data, just like the computer is turned on. However, it takes a long time, about an hour.

During this time, many scientists chatted casually. They tried to ease their nerves by chatting.

They talked about the universe, star road maps, sub-light spaceships, and the theory of relativity, which was esoteric, but also interesting.

With Yi Feng's current level of knowledge, he can also understand, and he also stood aside and listened with interest.

There are two scientists talking about sub-light speeds, which humans can currently see.

Sitting in the sub-light spaceship, the scene outside the window is very peculiar, all the stars in space are gathered in the direction of the head and tail of the spacecraft, if you look at it with the naked eye, the stars on the head are blue, and the stars on the tail are red.

Of course, at present, human radio telescopes can only hide behind Noah, and can only see the situation in the middle and rear.

From time to time, scattered stars flew out of the light cluster in front of the ship, and quickly flew backwards through the dark space, their color changing from blue to green, then to yellow, and when it crossed the ship, it turned red.

This is because the light waves are elongated, resulting in a redshift......

And, if a spacecraft is flying at sub-light speeds, and an astronaut inside can still observe the Earth behind him, he will see a slow-moving image of the Earth, as if the clock had slowed down.

When he moved 1 light-year away from Earth, he saw not a real image, but something from 1 year ago. Time has been inexplicably stretched by a light year, but in fact, this is just an illusion seen by human beings.

"Very interesting astronomical phenomenon."

"Yes......"

As people talked, minutes and seconds passed, and the gravitational-wave telescope was activated and the official search began!

The moment has come to decide people's fate! r