With years of technology accumulation, the ignition of the main engine of natural selection and controllable nuclear fusion have become relatively mature technologies. Although the real propellant free propulsion is still far away, interstellar navigation is no longer a problem.


    The propulsion working medium of natural selection is high-energy particles close to the speed of light in the accelerator. There are two symmetrical high-energy particle accelerators inside the spacecraft, which can save working medium to the greatest extent.


    According to the law of conservation of momentum, it is not difficult to see that the faster the material is pushed, the greater the acceleration it will bring to the spacecraft.


    If it is an ordinary spacecraft, even if it saves propulsion medium, it is difficult to achieve constant interstellar navigation. The reason is very simple. Traditional Rockets need to carry more fuel if they want to carry more things. However, the fuel itself has weight and wants to transport these fuels. We need to carry more fuel.


    However, the newly loaded fuel still has weight, which forms a vicious circle. The mass that a bulky rocket can carry may be a pitiful bit. Most of the fuel power is used to carry other fuels.


    In this way, it is difficult for the rocket, a working medium propelled aircraft, to make interplanetary navigation. If you want to fly so far, the total amount of fuel you need to carry is terrible.


    That kind of cost, I''m afraid, is just transporting a person to Bilin, and the resources consumed can ruin a civilization.


    It''s different from the black technology in different worlds. In different worlds, space technology is rampant, and the wearer doesn''t have a space ring. It''s embarrassing for good people to talk... Shame


    As for photography, people started by manufacturing storage equipment. Naturally, this kind of thing will not be lacking.


    Therefore, the problem is solved, and the vicious circle does not exist, because there is no need to have a headache for transporting fuel. In theory, he even makes and reserves a large amount of chemical fuel, which can fly to Bilin by means of chemical fuel rockets.


    The propulsion medium and fuel carried by natural selection can even propel it into thousands of light-years.


    Light years is the distance that light travels in a vacuum for one year, and the sun of Douluo is only about four light years away from its neighbor.


    With such energy reserves, sailing to Mars is more than enough.


    In addition to energy systems and thrusters, a starship also needs many devices, life support systems and gravity simulation devices, which are not mentioned. Navigation system is also essential. Navigation in the starry sky is even more difficult than over the sea.


    Only the stars in the sky can be used as a reference, and these stars are very small at a long distance. If you want to judge your position, you must accurately calculate the change of the position of these stars in the sky.


    In order to overcome all kinds of difficulties, the spacecraft was finally built after a full delay of nearly ten years. This time, the photographer is going to go to Mars with the ship in person.


    His goal is to leave a portal on Mars, so he won''t have to drive the spacecraft back and forth so hard next time. It can be transmitted through the office.


    However, one thing he couldn''t figure out was what the coordinates transmitted in space were based on. You know, no matter which planet in the solar system, they are rotating and orbiting.


    So the problem is, you left the coordinates here. The next time you come over, the planet under your feet may have rotated, or it may have orbited and left its original position. That transmission should have been in space. But the actual location is where you left the coordinates.


    Even if we don''t talk about the rotation and revolution of the planets, the whole solar system is in motion. In this way, spatial coordinates should appear in the universe, I don''t know where.


    From this point of view, all space capabilities have big problems. If you have to force an explanation of this phenomenon. It can also be said that the spatial coordinate is the position in an inertial system, which can barely explain why. The coordinates left on the surface of the planet will not suddenly go into space.


    However, practice is the only criterion for testing truth. In order to prevent him from leaving space coordinates and accidentally transmitting them to space, the photographer did a series of relatively rigorous experiments.


    Designing experiments is not difficult. The purpose of practice is to explore the performance of spatial coordinates in different inertial systems. When designing experiments, as long as you artificially create an inertial system, you can''t stop the earth''s rotation and revolution. But a train running at a constant speed in a straight line can easily control its speed or even stop it directly.


    The experiment was carried out on a straight railway. Firstly, spatial coordinates were set at the tail of the train to keep the train running in a straight line at a uniform speed.


    Then jump off the train and start transmission.


    The result is very amazing! After jumping off the train, the transmission position is not above the track behind the train, but directly inside the train.


    This seems to prove that the spatial coordinates do move with the inertial system. The train moving in a straight line at a uniform speed is regarded as an inertial system by the spatial coordinates.


    But this is only the first step of the experiment, the second repetition of the experiment. This time, the spatial coordinates are at the front of the train to keep the train running at a constant speed and in a straight line. Arrange the spatial coordinates, and then the train brakes urgently and transmits again.


    If the spatial coordinate is set on the inertial system, the transmission position should appear on the track in front of the next train, and the position of this coordinate will continue to move in that direction at the uniform speed of the train.


    But the result is that the transmission occurs at the position where the transmission coordinates were originally arranged on the locomotive. This is contrary to the previous conjecture. There are only two possibilities left. One is spatial coordinates, which is actually a kind of matter. Be left in sth.


    Another possibility is more terrible, that is, spatial coordinates are actually an idealistic setting. It will only send the person who arranges the spatial coordinates to the position he wants to go.


    It seems that the practice of the third part proves whether the spatial coordinates are material or against the heart.


    Now that the possibility of inertial system has been ruled out, there is no need for a straight railway in time. Just a lunar car that can travel on the lunar surface is enough.


    First, leave the coordinates on the trolley. Then let the car drive between supply stations on the surface of the moon. Every time you pass a Buji station, replace a part and conduct a transmission to confirm where the transmission is.


    It was originally a philosophical problem to drive until every part of the car was replaced with a new one. But now it seems to have affected reality.


    The results of this experiment will also determine the development direction of space technology.


    [to be continued]


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