The most extensive festivals on the planet are Christmas and above.

After three months away from Earth, the people on Mirai are about to usher in the first Christmas of mankind in space.

On Christmas Day, parents will put their prepared gifts under the Christmas tree, and the next morning the children will happily open the gifts and be happy.

However, there are no children on the Future today.

When the apocalypse happens, the first to be infected by the virus are the children with the weakest resistance, and the survivors on the earth are all members of the secret base, and there will obviously be no children in it.

So even though Christmas is coming, the Future has not become lively.

In the vast expanse of space, humanity is isolated and has no idea what the future will face, but staying where it is, there is only a dead end, so no one has the heart to go to Christmas.

At this moment, there is only one thought in everyone's mind, and that is to escape.

Mars has become a faint white dot, and it has been a month since Mirai left Mars, although it is still far from Jupiter's orbit, but when you look at the Earth from here, it is already a small and inconspicuous white dot like Mars, just like looking at Mars from above the Earth.

There are no obvious stars in sight, and even the sun is just a bright spot in space, completely different from the basketball-sized fireball when viewed on Earth.

Instead of moving along the plane of the ecliptic, Mirai is moving in the direction of Alpha Centauri at an angle inclined to the plane of the ecliptic.

The Alpha Centauri system is a system of three stars, and in some science fiction novels, it is a secret base for aliens, but in fact human observations over the years have found that there is no sign of civilization there.

The reason why the Illuminati Alliance chose to advance towards the Alpha Centauri galaxy is that it is the only place where humanity can hopefully reach, provided that humanity can develop artificial hibernation technology before the fuel is lowered below the warning line, otherwise humanity's resources will be exhausted on the way, and it will eventually become dead dust drifting in space.

The Alpha Centauri galaxy is a little more than 4 light-years away from the Earth, and the Alpha C Centauri star, named Proxima Centauri because it is closest to the Earth, is only 4.2 light-years away from the Earth, and is the closest star in the universe to the Earth except for the stars of this galaxy.

If humanity can successfully reach the Alpha Centauri system, then it will have tens of thousands of years to develop, and the hope for the future of mankind lies here.

Of course, this hope is really too slim.

Human technology is far from being able to carry out space navigation at the level of a galaxy, and there is still a huge gap, as far as the current technology mastered by human beings is concerned, at a speed of 44 kilometers per second, it will take 28,000 years to complete the distance of 4.2 light years.

This is undoubtedly an astronomical figure, and as far as the current situation is concerned, the best situation for mankind is to be extinct to the last man in the vast space of space.

But even so, in the last days, the Alliance of Light still chose to escape from Earth.

However, at that time, the idea of the Light Alliance was that as long as he left the earth, he could develop on other planets in the solar system, and he did not consider leaving the solar system, but when he saw that the demon had evolved the ability to fly, human beings had to continue to flee outside the solar system.

With the help of the Earth's rotation, Mirai has a relative speed of about 40km at the time of launch, and then after the acceleration of the moon's gravity, the relative speed reaches 44km per second, but this is already the limit, whether it is the power of the ion engine made by humans, or the bearing capacity of Future, it is no longer able to withstand higher speeds, if it is forcibly accelerated, the ion engine will be burned out, and Mirai will collapse.

The reason for this is because of gravity.

It's not that Mirai flies into space, and then it can fly by inertia without gravitational control.

In order to maintain its speed, Mira's engine must generate the opposite force to maintain its speed, and without this thrust, Mira's orbit will enter an orbit controlled by the sun and cannot leave the solar system.

Planets, comets, all orbit under the control of the Sun, but FutureR does not orbit the Sun precisely because the ion engine is working.

Since gravity is not limited by distance, Mirage will always be subject to the Sun's gravitational pull, but this gravitational pull will gradually decrease.

It's like throwing an apple from the earth, no matter what kind of parabola is used, it will fall, the difference is only the distance and height of the throw.

If Mirai sails by inertia, then Mirai will revert towards the Sun like an apple thrown from the Earth, and eventually enter an orbit around the Sun.

Future's purpose is to leave the solar system, so it must provide acceleration against the sun's gravitational pull.

On Christmas night, on the Future spacecraft, Su Meng was looking at the reports and materials on her laptop, busy.

At present, the work of correcting and maintaining routes, as well as recording navigation data, is done automatically by the master computer, but it is still necessary to check every day to find out the errors or hidden dangers of the master computer and fix them.

After doing it, Su Meng stretched.

"Today is Christmas," Su Meng muttered to herself, with a lot of helplessness in her words.

Although it is Christmas, no one in the Light Alliance has the idea of Christmas.

All human beings at this moment have been pushed to the limit, and the moment of death is chasing after them.

The design maximum speed of Mirai is 50 km/s, and Mirai is currently accelerating a little bit, but because it is in the inner solar system, it is subject to the gravitational pull of the sun, so the acceleration effect is very slow, and it cannot increase the speed of a unit with two decimal places in a few days.

Considering that going to the Alpha Centauri system in the future will require a lot of fuel for intrastarial navigation, Future will have to leave half of the nuclear fuel in reserve.

At present, Future's fuel is mainly used to correct and maintain its course and resist the sun's gravity, but even with the best efforts to economize, the fuel consumption is still very staggering, because the weight of Future's is too heavy, a full 15,000 tons.

But the weight of 15,000 tons is also the limit that human beings have broken through with the continuous optimization of supercomputers.

On the Future, there is a large and stable air circulation system, temperature control system, and gravity control system, all of which are also consuming the energy of Future.

Future is currently in the midst of a 15-minute autobiography, giving Mirage's room a simulated gravity that is about the same as the Earth's surface but slightly smaller.

The outside scene displayed on the display screen in front of Su Meng was a still picture obtained by the image correction obtained by the numerous optical sensing devices arranged outside the hull.

The real Future is like a spinning bullet, heading out of the solar system.

On Christmas night, on the Future, there was no festive atmosphere, there was just fear and fear and despair.

38 trillion kilometers away, is the destination of human beings, 28,000 years, to get there, no one, will not feel hopeless.