Of course, Yun Lei and the others did not dare to assert that after leaving the starship, they drove the lunar rover of the same model used on the lunar base to the destination. It is said that there should be a liquid lake there, or an ocean!

However, unlike Earth, Titan's temperature is extremely low, with an average temperature of around -180 degrees Celsius. As a result, the water that forms the main circulation on Earth is frozen into huge glaciers on Titan. So, the clouds on Titan, and the liquid flowing on the ground, will never be water. It's something like methane.

Titan's thick clouds and dense atmosphere reflect most of the light, much like the Earth's glaciers reflected sunlight during the Ice Age. These dense gases will not only not constitute a greenhouse effect, but will constitute a kind of anti-greenhouse effect.

This anti-greenhouse effect will keep the methane ocean on Titan in a liquid state instead of being evaporated.

According to the Thunder and previous human explorations, the ocean on the surface of Titan is not large, located near the south pole of Titan, covering an area of about 34,000 square kilometers. Next to this huge lake is a swamp made of liquid methane.

Yun Lei and the others drove the lunar rover all the way. As we approached our destination, a torrential downpour of rain suddenly began to fall between the crimson sky and earth of Callisto. The raindrops in this pouring rain were all methane! And in the midst of the heavy rain, in the sky of Titan, among the red clouds, there was a sudden flash of thunder and a loud bang.

Cloud thunder senses the thunder above the clouds of Titan. It was found that although the size of this Titan is not large, due to the relatively dense atmosphere, the power of this heaven and earth thunder is actually no less than the heaven and earth thunder naturally released by clouds and rain in the earth's atmosphere!

This massive methane rain covered the entire Antarctic region of Titan. Yun Lei and others were on the move, calculating the amount of rain in this methane rain. As a result, in just a few hours, at the end of this rainstorm, the amount of methane rain has reached 40 centimeters. It is also thanks to this lunar rover to avoid some relatively large stones. The site of the design is relatively high.

Not to be drowned by the torrent caused by this methane rain. And Yun Lei and the others could only drive the lunar rover to a higher ground as much as possible to avoid the torrent of liquid methane caused by the methane rain.

Not far away, the iceberg formed by the condensation of water, because of the loose structure, under the washing of this huge torrent of liquid methane, actually appeared landslide......

All of this, except for the difference in temperature gradient and material composition, is too similar to the scene after a rainstorm falls on Earth, no wonder many scientists think it. On Titan, there is a good chance that there is life. Not necessarily this kind of life on Earth, of course.

In general, many people, including many leading scientists, believe that water is the source of life. Because water is the solution and medium necessary for the life of all proteins. According to the model of the origin of life on Earth and the mother star of Atlantis, various chemicals are dissolved in water, and then chemical reactions are generated.

Then it forms organic macromolecules, then forms genetic genes, and then completes the leap from the material world to the biological world.

But is there only one kind of life in this universe? Is it possible to form a form of life that is completely different from life on Earth by relying on a combination of chemical substances that exist on other temperature gradients and rely on a completely different set of chemical substances from life on Earth?

Logically speaking, this should be possible! Water is certainly a very common and excellent solution and medium, but water is not the only such excellent solution and medium in the universe! According to the idea of the famous biochemist Asimov in his article "Not What We Know."

In this universe, according to the temperature ladder from high to low, there are very likely six types of life forms.

The first is a fluorinated silicone organism with fluorinated silicone as the medium, and this kind of organism must live in an extremely high temperature environment.

The second is sulfur fluoride organisms that use sulfur as the medium, which also live in high temperatures. Creatures with completely different systems from humans. However, in reality, there are self-managed bacteria in submarine volcanic craters that produce energy and organic matter through the interaction of hydrogen sulfide and oxygen, as well as anaerobic archaea in sulfur mines, which are organisms that use sulfur as a medium.

The existence of such a creature at least proves that Asimov's inference is not groundless.

The third type is humans, which are oxygen-based, water-mediated nucleic acid-protein organisms. The temperature at which this creature can survive is the temperature that is suitable for human survival.

And down this temperature ladder, there are three possible types of life. One is a nitrogen-based, ammonia-mediated nucleic acid-protein organism. Since ammonia is still liquid below zero degrees Celsius, many scientists imagine that there may be oceans made of liquid ammonia beneath the surface of some cold giant gaseous planets. The ocean of liquid ammonia is full of this ammonia-mediated life form.

The other is the methane-mediated lipid organisms that may exist on Titan. Methane is also an important raw material for the chemical industry today, and there are many substances that can be produced and synthesized. Of course, it is also possible that the organisms that exist on Titan can adapt to lower temperatures, and the last one, the hydrogen-based lipid compound organisms.

According to scientists' assumptions, it may be possible that the microorganisms on Titan could use acetylene to chemically combine with hydrogen to obtain energy. Sustain your own life movement.

Of course, these are just assumptions. Except for the heat-resistant archaea that use sulfur as a medium, several other organisms have not been proven. Even the records of the Atlanteans only confirm that there were only two kinds of life, water as a medium and sulfur as a medium.

However, if we can follow this temperature ladder, we can discover and confirm some life existences that can produce energy with other media and chemical reactions to sustain their own survival. Then, the perspective of human beings on life should be completely different. The angles and depth of the search for extraterrestrial life will also be very different.

Perhaps, silicon-based life, really exists?

Therefore, the scientific significance of exploring the existence of life on Titan is greater than finding the meaning of life on Europa.