Since Europa 2 is about 670,000 kilometers from Earth, the lightsail will only take 31 hours! In space, due to the early development of the solar system, people felt the need for a place similar to a transit station, so under the auspices of Mr. J, before Zhixin joined, Kars designed and built a huge space station, the barn. Transporting supplies to this space barn by a round-trip spacecraft and completing the launch mission from here can save a lot of energy. In the early days, there were too many pea launch missions, so ground launches were taken, and with the further expansion of the barn, the main space corn has gradually been switched to the barn.

This time, the launch of the Gray Rain robot to Europa 2 will take 11 years to reach from Earth, and only 2 years from the barn. With the increasing upgrading of the barn, the construction plan for the upgrading and transformation of some extraterrestrial bases has been gradually put on the agenda, and batches of gray rain robots have also begun to be launched from the barn to Titan and other bases with a certain scale for reconstruction and expansion projects.

Europa is slightly smaller than the Moon at 3,100 kilometers in diameter, and its outer layer is covered with ice up to 20 kilometers thick, and the surface of this object is very "smooth" due to its internal energy source, deep under the ice or with a liquid water world. There are only a few places where the surface has an elevation difference of more than 1 km, and because of the extremely smooth surface, it was named Europa, a Phoenician princess in Greek mythology. The cross-patterned cross-patterned pattern on the surface resembles the princess's lace skirt.

But the heat energy provided by tidal forces may keep the water below the surface ice in a liquid state. This conjecture was initially triggered by a series of speculations about tidal heat (a consequence of the slightly eccentric orbit and the orbital resonance between Europa and other Galilean moons).

Beneath the ice is the largest liquid water ocean in the solar system, with a thickness of about 80 kilometers. Its orbit is very close to a perfect circle, with an eccentricity of only 0.009. Like other Galilean moons, Europa is tidally locked by Jupiter's gravity, so there is a hemisphere that is forever facing Jupiter. The heat and energy converted by the gravitational pull of Jupiter and other moons in different directions creates a tidal resonance effect, which liquefies the interior of the ice into an ocean.

There are also many saltwater lakes with a staggering amount of water in the 20-kilometer-thick ice formation, like bubbles in the ice, the largest of which has been discovered so far, just 3 kilometers from Europa's surface, and its volume exceeds the total volume of water in the Great Lakes.

Therefore, it is very likely that extraterrestrial life will be found on this planet, but due to many economic reasons, and the fact that there is no such urgent need as it is now, no exploration of Europa's underground ocean has been launched.

But this time is different!

The tides inferred from the earth's magmatic circulation detected from the outside are actually the same as those that Lin Dezhixin used to detect through the shell of the equipment with a broken needle, and there are very few parts that can be understood. Lin Dezhixin and his ability to infer the function of the equipment through this limited information are mainly due to the fact that they have accumulated many supercomputers by themselves, and they are very clear about the internal structure and function.

But no one knows what is going on with the magma circulation system, especially the deep gravitational tides, which have hardly been able to be modeled. However, if some valuable models can be established through the study of Europa, it will be of great significance for accurate judgment. And if you can accurately judge, maybe you can effectively implement some means to circumvent it.

This time it can be said that it is rare to invest a huge amount of power.

Of the 120 Grey Rain robots that will be put on Europa, one is all made by MaceFrog's affiliates. The exterior looks like a normal engineering gray rain robot, but of course this appearance includes the internal structure that will be inspected during take-off inspection. But in fact, the entire 5-kilogram gray rain robot is produced by the nanorobotics company of Mace Frog, and it is difficult to find the hidden neuronal hosts and countless micro-tissue structures without radio microscopes.

This robot is what Mace Frog is going to use as his own Europa base. Combined with the many pea skins that are already over there, after a period of growth, it can become a biological neuronal supercomputer that rivals the Mace Frog that has been secretly built on Earth. And it has a certain degree of production demand, for example, although some excavation functions are not as powerful as excavators on the earth, but at least it is better than peas using roots to drill ice. Another is the function of supercapacitors, although the pea skins can barely relay the signal of the photon man, but they cannot provide them with accommodation.

The only relative he recognizes is the light Metz frog who calls his brother all day long! Mace Frog felt the need to take care of him, and also needed to arrange a living space for him.

In addition, this robot and its successors will need to be able to fight against weapon systems from Earth!

The Grey Rain robot, which carried all the hopes of Mace Frog, flew to Europa 2 with the others. Mace Frog watched the broadcast with a lot of emotion, and it was not far from living without worry.

In fact, in addition to Mace's plan, Mr. M proposed another plan, that is, since peas have grown in many alien environments that lack liquid water or even atmosphere, and a sufficient number of pea brains can also carry 16 billion neurons of human beings, then human beings can be widely sent to deeper space! Even if it is not too far away, the total number of celestial bodies in the Kuiper Belt and the Oort Cloud in the solar system alone is enough for human digital spirit bodies to habit.

Mr. M's proposal is not unreasonable, the current development level of Taoyuan Star is barely enough to live hundreds of millions of people, which is far from enough. There are still a large number of people who have nowhere to settle, so at least there is something wrong with the earth, and there needs to be a place to settle.

Therefore, after the discovery of black walnut, there were three such plans, one is Mace Frog's plan to study Europa's underground ocean, and the second is Mr. M's plan to expand the carrying capacity of peas and temporarily inhabit various celestial bodies in the solar system.

And the third plan was proposed by geological experts, the creep plan!

At a stage where the gravitational tidal and thermal cycles of deep magma are not yet known, the only thing that can be implemented from the information obtained from surface detection is to relieve the stress in the formation, and the only prestress is the creeping plan.

The principle of the creeping plan is very simple, that is, it pushes and kneades the strata like a massage, so that the stress between the plates is slowly released, and the plates move little by little in the direction of releasing energy like worms.

But it is very difficult to implement because it requires the energy of one or even several hydrogen bombs, and then with extremely high control, they are slowly and gently applied to the plate that needs to be used!

PS: The Galileo moons were named by Marius after the Greek mythological characters Io, Ganymede and Callisto, Europa, all of whom are known for their handsomeness.

Ice thickness, the depth of the ocean under the ice, Baidu Encyclopedia has a mistake and hopes to correct it.

The U.S. Congress asked NASA to launch the mission using the powerful Space Launch System (SLS), which would allow the Europa Clipper to fly directly to Jupiter in just 2.4 years. However, SLS is still under development and has experienced many delays and cost overruns and has not been built. The first is to consider that this can definitely be built in 200 years, and the second is to consider that the launch of fuel rockets and solar engines actually have little room for technical speed improvement.