After the class of the mimic classroom ended, Hua Feng and the others suddenly received a new home that they were going to Titan, which is now known as the "second home" of mankind. Experience what your second home is doing now after it has been improved by humans.

On the spacecraft to Titan, Sun Xing, the teacher who led the team, let everyone recall the lessons about Titan. After Hua Feng gradually accepted that Sun Wukong was Sun Xing, he was not surprised that he was now the chief instructor of the academy's training.

He glanced at the two stunning beauties beside him, Yun Meng and Bai Feng, who were silent with their eyes closed, as well as hundreds of students from the same period, and silently recalled everything before. Hua Feng knew that this journey, which had been greatly shortened compared to the previous one, would take at least three days to reach Titan.

On October 22, 2012, according to the latest images sent back by NASA's Cassini probe, scientists have identified some huge high-temperature dome-shaped structures on Saturn's largest moon Titan. This is much like what you see when baking bread, when baking is done, the crust of the bread bulges and cracks. Scientists now believe that something similar is happening on Saturn's largest moon.

Scientists have previously observed similar terrain on the surface of Venus, where a tree called Kunapipi (Ku

apipi), the probe photographed a dome-like bulge about 20 miles (30 kilometers) in diameter. The researchers also believe that a narrow rift valley about 70 kilometers long observed on the surface of Titan is also due to surface cracking caused by the upwelling of the underlying material, which may be magma.

"This dome-shaped formation, which we have never observed before on Titan, shows that the planet continues to surprise us even after eight years of exploration," said Rosaly Lopes, radar equipment scientist at NASA's Jet Propulsion Laboratory (JPL) Cassini Project. ”

This unique tectonic topography may be similar to Earth's rock cap, which is formed by the condensation of rising intrusive lava. Mount Henry in the U.S. state of Utah is a prime example of this landform. This image showing the structure of the vault was taken by the Cassini probe on May 22, 2012, using radar equipment.

The other one is led by Ellen Thofen

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The team of Cassini scientists took a closer look at radar images of Titan's southern hemisphere and found traces of ancient coastlines here. Titan is the only planet other than Earth that has been confirmed to have a stable liquid on its surface, even though these liquids are not water, but hydrocarbons.

The presence of vast oceans has only been observed in Titan's northern hemisphere. However, an analysis of the data collected by the Cassini probe between 2008~2011 shows that there was also a vast shallow sea area near the south pole of Titan.

Dr. Stephens and her colleagues identified traces of two oceans that had dried up or were mostly dry in the southern hemisphere of Titan. At one point, the area of one such dried ocean may have reached the size of 475x280 kilometers, and the depth could have reached hundreds of feet. Lake Ontario (O. Ontario), the largest lake in the southern hemisphere of Titan, is the largest lake in the southern hemisphere

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io Lacus) is located within the confines of a dry ocean, which appears to be the only remaining part of what was once a vast ocean.

And the other was led by Cassini radar team member, Oded Aha of Caltech

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The Ph.D.'s research team believes that Titan is undergoing long-term changes similar to Earth's Milankovitch cycles, which are the result of long-term regularity in orbit. This long-term climatic change will cause Titan's surface fluids to migrate back and forth between its northern and southern hemispheres. According to this model, Titan's southern hemisphere should have had a vast ocean about 50,000 years ago.

"The ocean on Titan's surface is a ready-made laboratory for the chemical environment of pre-life life, and we also know that it is migrating between the northern and southern hemispheres on a cycle of about 100,000 years," said Dr Thofen. "I'd love to take a closer look at Titan's oceans in the northern hemisphere and the dried up marine remnants in the southern hemisphere to see how far these pre-life chemical evolutions have progressed," he said. ”

Cassini's team has largely confirmed the stability of Titan's northern hemisphere ocean system. They have been constantly monitoring the oceans here for the entire Titan-season (about 6 years on Earth). In this image, taken on May 22, 2012, scientists found that the shorelines of lakes in the Northern Hemisphere have not changed, suggesting that lakes in the Northern Hemisphere are not seasonal. In contrast, after a storm in 2010, there was a noticeable darkening near Titan's equator.

It has long been believed that Titan is the largest moon in the solar system and has been named Titan. In Greek mythology, the Titans were a family of giants. Titan is what scientists believe to be the most likely planet in the solar system to have life outside of Earth. It is the only moon in the solar system with a thick atmosphere.

Unlike Earth, where the atmosphere is mostly composed of nitrogen and oxygen, Titan's atmosphere is mostly methane. Moreover, the dense atmosphere reflects most of the light, causing an anti-greenhouse effect, making Titan's surface very cold, with a temperature of -180 degrees Celsius, making it impossible for liquid water to exist. But in 2005, two teams of scientists suggested that extraterrestrial microbes might live in the liquid hydrocarbons of Titan Lake. Scientists say that acetylene is formed in the atmosphere of the Titan and descends to the surface of the Titan. Alien microorganisms eat acetylene and synthesize with hydrogen to obtain energy.

Since then, dozens of lakes have been discovered on the surface of Titan, which scientists believe are filled with a mixture of liquid ethane and methane. However, since no probe spacecraft has taken direct samples of Titan Lake, no one knows the exact amount of acetylene in it. In 1989, scientists estimated that the amount of acetylene in the hydrocarbon liquid in the Titan Lake was only a few parts per 10,000.

A team of scientists led by Daniel Caudier of the École Nationale Supérieure des Chemistries in Rennes, France, has made a new calculation of the acetylene content of the Titan Lake. Based on newly obtained data from the Cassini-Huygens mission to explore the Saturn system, they made an updated estimate that the Titan Lake contains more acetylene. If alien creatures are present on Titan, the acetylene inside the lake is enough to feed any hungry alien creatures. In 2005, Cassini's Huygens probe landed on Titan, which is filled with liquid methane. Huygens was working 24 hours on Titan, focusing on detecting possible signs of life on Titan.

People have the impression that Mars has always been an ideal place for extraterrestrial life and human migration. However, as Titan's face is gradually revealed, this view fades. Human research has found that Titan is the Earth 4.5 billion years ago. Titans have two characteristics that life prefers, and that is boiling organic compounds and a dense, protective atmosphere.

Titan is the only moon in the solar system with a qualified atmosphere, and one of the only four rocky planets in the solar system with a dense atmosphere, the others being Earth, Mars and Venus. In some ways, Titan's atmosphere is most Earth-like. Its atmosphere is mainly composed of nitrogen, and the air pressure is slightly higher than that of the Earth.

It even has clouds on it, except that these clouds are made up of methane and other hydrocarbons, not water. Many space biologists are eager to study Titan's atmosphere as a prototype of the Earth's atmosphere, hoping to discover how complex organic molecules were created before the emergence of life on Earth.

Viewed from Earth, Titan is enveloped in a dense atmosphere that prevents people from glimpsing its true face. According to spectroscopic analysis, there are intense chemical reactions in the atmosphere. On January 14, when the "Huygens" probe successfully landed on the surface of Titan, the earthlings really witnessed part of the "appearance" of Titan with the help of "Huygens's" eyes. The lander took a large number of images in its only 30 minutes of "life", including one image of Titan's surface that shocked the world——— vast plains, scattered with large and small stones and ice-like objects, and the orange sky was fascinating. This is the first time humans have landed on this mysterious land, and will it give birth to life?

On June 29, 2005, the Cassini spacecraft orbiting Saturn once again shocked the world with a photograph taken by the spacecraft. Photographs show a lake-like feature in the Antarctic region of Titan. Observed at about 234 kilometres long and nearly 73 kilometres wide, the landscape appears to be a dark patch with a smooth, winding border, surrounded by light-coloured Titan clouds.

Scientists at NASA's Jet Propulsion Laboratory believe it could be one of Titan's surface methane lakes, one of the organic compounds necessary for Earth-like life. Cassini will fly over Titan 39 times in the future, and if any of the "dark spots" are photographed reflecting like mirrors, it will prove that it is a real liquid lake, and if it is confirmed, then we have reason to believe that new life will be born here.

In the known solar system, Mars and Titan are the planets with the most living conditions, although there is some imagination in this, but from the results of the "Cassini" exploration, the shape of Titan is very similar to the Earth 4.5 billion years ago. According to the analysis, judging from the activities of Titan, if there is no accident, then a new earth-like life will appear on Titan in 15~2 billion years, and human beings will no longer be lonely in the solar system.

The earth is not our eternal home, and our source of life——— the sun, has only 5 billion years of life left. In more than 5 billion years, when the Sun is separated from the main-sequence star, the Sun will change a lot, the Sun will slowly expand, and all the inner planets will be mercilessly swallowed up by the Sun, not to mention the Earth, and what will be the fate of us human beings? Fortunately, in the 21st and early 22nd centuries, we have at least superficially learned about Titan, and these profiles have led us to determine that it is an ideal place for us to settle, much stronger than Mars. First of all, Titan has a thick atmosphere, which is the most powerful barrier against any invasion of the universe.

Second, Titan is far away from the Sun, and even after the Sun expands, it has no effect. In addition, the originally cold Titan will be "warmed" by the body temperature of the expanding sun to the point that it is acceptable to humans, and the atmospheric pressure on Titan at that time is basically suitable for the survival of earth-like life, and it will become another home for humans. None of this is very difficult to do on Mars.

Howard Zeebecker of Stanford University, USA

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One of the research team members, he said: "Smoothing in the true sense of the word can only be achieved unless you pour concrete into the lake, which does not exist on Earth." Astronomers have wondered whether Titan, Saturn's largest moon, is dry or wet, but there is plenty of evidence for the presence of liquid lakes on the moon.

The Cassini probe's radar device arrived in the Saturn region in 2004 and found dark patches in Saturn's polar regions, and the dark areas detected by the radar devices suggest that the region is very smooth, suggesting that the surface of the liquid lake is very smooth and difficult to reflect the detection signal.

Spectral data shows that lakes clearly visible on Titan's surface are filled with methane and ethane, which can exist in liquid form on Titan's icy surface. Morphologically, Zeebecker said, they look like lakes. However, previous radar observations have shown that the clear lake was formed at an angle, and it is not possible to reflect bright radar flashes from the surface of the lake, suggesting that the lake may be a dry riverbed or a soot-filled muddy bottom.