Fan Xing asked, "What do you mean? I don't understand that you can send objects to our solar system more than once, and even now you can control our Internet, you can do such things, shows that your level of science and technology is far beyond us, why do you need our help?"
System: "Our world is dying"
Fan Xing: "What? Can you tell us exactly what happened?"
System: "Our star Sunli is already in the final stage of the main sequence, and scientists predict that it will enter the next stage: the red giant stage in tens of millions to 200 million years."
The system continues: "The main element of star formation is hydrogen, and the main sequence star phase is the phase of nuclear fusion of hydrogen to produce energy, and as hydrogen is gradually converted into large amounts of helium and other elements, the hydrogen will become less and less." When the hydrogen is not enough to sustain the star, the interior of the star will collapse due to gravity, and the pressure and temperature inside the collapse of the star will provide the conditions for helium fusion, and the fusion of helium will be very intense, so the star will expand many times larger, and this is the red giant stage."
The holographic projection also demonstrates the process of a star becoming a red giant along with the introduction of the system.
Fan Xing has some basic astronomical knowledge about the various stages of the evolution of stars. Just like the solar system, scientists predict that the sun and the main sequence star stage has 5 billion years of life, if the sun's internal hydrogen is exhausted, it will enter the red giant stage, and enter the red giant stage of the sun will expand dramatically, and even swallow the Earth.
Fan Xing: "200 million years, even if there are tens of millions of years for a civilized world is a very distant thing, our history is only 5,000 years, and your science and technology is sufficiently advanced, even if not tens of millions of years, give you tens of thousands of years to develop science and technology can completely realize self-salvation."
"No, we don't have tens of millions of years, not even tens of thousands of years, at most 5,000 years, at least 3,000 years before the end."
"What? Didn't you say we're tens of millions of years away from the red giant stage?"
"The end is not for Sunli to become a red giant and engulf our planet Issa. It's a helium flash."
"Helium flash?"
System: "At the end of the main sequence star stage, the helium inside the star is constantly increasing, and the distribution of material inside the star is not uniform." Due to the internal motion of the star and the action of the magnetic field, there will be helium accumulation in some places, resulting in local helium nuclear fusion, which is a helium flash. Helium flashes produce intense electromagnetic radiation, like water dripping into a hot pan of oil. This helium flash reaction can be light or heavy, light means that the radiation value is higher, and heavy we may directly destroy."
By holographic projection, the star produces a bright spot of light that spreads rapidly, a strong splitting electromagnetic storm blows toward a planet, and high-temperature radiation quickly envelps the entire planet.
Fan Xing: "So you predicted a helium flash in 3000-5000 years?"
System: "There have actually been 739 helium flashes. Helium flashes cannot be predicted accurately. All the data obtained by current detection methods comes from the star's surface chromosphere, or atmosphere. Just like you can only observe the Earth's atmosphere in space, or the surface of the land and ocean, and the earthquake volcanoes generated inside the Earth can not be directly observed, but can only be predicted and judged by the effect of these geological activities on the Earth's surface and atmosphere, and we predict that 3-5 years is just a critical value."
"Since there have been hundreds of helium flashes, what about this prediction of 3-5 thousand years?" Fan Xing continued.
"3-5 years is the critical value, helium flash occurrence is to have certain conditions, star temperature, pressure, and helium content and other factors, 3-5 years after the content of helium will reach the critical value, with critical conditions will inevitably occur helium flash." However, it does not mean that helium flash will not occur unless critical conditions are reached. The internal activity of stars is very intense, and the intense activity causes local areas to reach critical conditions, which is what causes the helium flash to occur prematurely. Early helium flashes can be small and weak. If critical conditions are reached, a larger helium flash must occur, so we have 3-5 thousand years at most."
"Let me save you, how? Three to five thousand years is not a short time, since you have now been able to send things like host, three to five thousand years must also be able to build spacecraft to come to our solar system, do you want the Earth? Impossible? How can I help you get the Earth?"
System: "We don't want the earth. We're just looking for a place to live. We can rent or buy land."
"Are you asking me to buy land with money? There are indeed many countries on Earth that sell their land and even their islands."
"No, the premise of all this is that we can achieve manned interstellar travel. This is the barrier we hit. If we can't do that, it's all empty talk. We'll be locked up in the Sunli system. So the main task is to help you break through the technology to make interstellar travel possible, and we will have the technology to do the same. Only by leaving Sunli can we have any hope of survival."
Fan Xing: "Interstellar navigation, even if these are true, but there are still some contradictions, your space technology is already very advanced, how can you need our help?"
System: "By interstellar flight, I mean lightspeed or faster-than-light technology, although we are far ahead of you in traditional momentum rocket technology, but traditional rocket technology can not achieve manned interstellar travel, even nuclear-powered space technology can not achieve." Lightspeed travel and conventional momentum rockets are two completely different areas of technology, and that is a gap we cannot cross. We are equal in that regard."
Fan Xing: "Nuclear powered spacecraft, how is this possible, why can't we achieve manned navigation?"
System: "It is impossible to achieve manned interplanetary voyages. The traditional momentum rocket refers to the propulsion technology that works by the principle of conservation of momentum. To get forward thrust, the spacecraft needs to constantly push the propellant backwards. Both solid and liquid rockets rely on intense combustion to produce high temperature and high pressure gas to eject backward to produce thrust. The same is true of electropropulsive ion propulsion or what you call Hall thrusters here, except that they rely on electromagnetic forces to send propellants out to generate thrust. The nuclear rocket is a combination of these two technologies, also rely on propellant work, so these technologies are actually a class of technology, we also collectively referred to as first-order civilization technology."
At the same time, the holographic projection continues to accompany the transformation of the system
"M ship V ship =m push v push, change it a little bit V=mv/M or M =mv/ V, there are three ways we can get a fast enough spacecraft speed: increase the propellant mass, but increasing the propellant mass also increases the spacecraft mass." The second way is to increase the propellant speed. The third way is to reduce the mass of the spacecraft. If we build ships big enough for people to ride, we lose speed. So interstellar travel with the whole first civilization technology is a paradox."
"We can spend more than ten years to send about 100 kilograms of objects to the solar system, is already the limit, the mass of host is equivalent to the mass of an adult, if the host is replaced by an adult, we have to consider human activity space and a person's food consumption for more than 10 years." The minimum consumption of a person a year is also 1 ton, more than 10 years of interstellar navigation will need to increase more than 10 tons of food, which does not count other materials required by biological needs, the actual mass of an object to a person has increased by 100 times, but in order to reach the Earth for more than 10 years, you need to sail according to the original speed, but the weight of the spacecraft will inevitably reduce the speed. The plan to maintain the original speed had to increase the mass of the propellant, and if we gave up speed, we would have to increase the flight time, which would return to the paradox of increasing supplies.
Of course you could talk about biocirculation, or hibernation technology, but there's no way you can achieve 100% cycling inside a ship. Hibernation technology also requires equipment to sustain, this is just one person, if we are going to transport 10 people, that is thousands of times the growth, the growth is even more than the exponential level, so only the technology of a second-order civilization can achieve interstellar travel."
With the explanation of the system, Fan Xing gradually understood the theory of the system, interstellar travel only exists in science fiction movies, and almost no one can see this problem in the real world space field, not no one to discuss, but the result is as follows, there is no sense to discuss, just like Voyager 1 has not really stepped out of the solar system (Kuiper Belt) for decades.
Fan Xing: "Second-order civilization? Warp drive technology?"
System: "Our definition of a second-order civilization is a civilization and technology that can achieve large-scale light speed travel, warp drive technology is only a theoretical idea in your case." In our definition of second-order civilization, electromagnetic force, gravity, space, dark matter related forces, etc., can achieve the transmission and action of the speed of light, and in these directions can produce the scientific achievements of the speed of light travel, warp drive technology is by generating space-time curvature, only based on the phenomenon of gravity warping space concept, can only be said to be a branch."
Fan Xing: "How much ahead of us are your technologies?"
System: "In your time we found the Earth 9235 years ago"
For more than 9000 years, it turned out that we have been under the surveillance of others, Fan Xing secretly marveled
"You have been monitoring us and must have sent many probes to Earth," Fan Xing continued.
System: "Not a lot of success, all of our scientific power is basically used to fight the helium flash crisis." Only 53 times have been recorded, the first time 19 years after the discovery of your Earth. At that time, due to a helium flash, some radicals hatched a plan to fly to the solar system in a spaceship, according to the remaining data at that time, they reached the Earth tens of thousands of years.
But 36 years after the departure of the ship received the last message is no longer, the level of technology at that time is decades earlier than you are now, but this kind of thing is meaningless, the energy is exhausted they have long become lost in space a pile of ruins.
Also because of the helium flash, there was the first spaceship to escape, in the following years, there were 29 escape events, but soon by our government strongly banned, after a period of cooling-off period, a lot of spacecraft crash and loss of contact information has been returned, only really let people see this meaningless thing, since a long time has not been launched again.
The earth probe launched in the true sense was launched 1021 years ago, after 50 years to reach the earth, due to limited technical conditions, the probe crashed after several circles, your historical records in the Song Dynasty Renzong Emperor and the first year of May (AD 1054), the sky fire meteor event during the day, is this event.
At that time, we also obtained the first Earth data and learned that there was a civilization on the Earth, but the Earth civilization did not have the conditions for two-way communication with us at that time, although we found the Earth civilization, such a detection is meaningless as before, and the reason why our planet's interior has not been large-scale exploration.
When we relaunched the probe over 200 years ago, we saw that your world had changed dramatically, and we began to plan and eventually plan this mission."
Fan Xing listened with surprise to everything the system said: "Your plan is to rely on the earth to achieve the speed of light spaceship plan?"
"Yes, now you have the preliminary conditions for the development of such a technology, host of all our technical data, depending on these two hundred years or so on the level of technological development on Earth enough to reach us, we have enough time under the collision of two civilizations to travel at the speed of light."
"Why is it..."
Fan Xing's words were not finished, a sense of vertigo began to come, and he felt his body gradually numb, lost consciousness, and lay down on the bed.