After so long of learning and discovering, Hua Feng slowly learned that the human beings on the earth have actually been making preparations with both hands, and if the plan to repair the space fails, the earth will become an uninhabitable or occupied planet. Then they will travel to the planets and moons that have now established their forward bases, and work for the continuation of humanity. Although, when the time comes, the environment is harsh and various factors are not suitable for human life, they will do their best to survive.

At this time, the various federal states are already preparing for the transportation of supplies, and before it is determined that the Earth will be safe after 2121, most of the human elite and dignitaries will be sent to Mars, the moon, and the habitable planets of Iomede and Enceladus, and then decide whether to return after the apocalypse.

Sometimes, Hua Feng couldn't help but sigh, in the face of such a big unknown, he was not sure what the future would be, but fortunately, there was still a direction for his efforts......

Cassini at the time called the four moons of Saturn he had discovered (Titan, Dionie, Leah, and Iapetus) the Side of Louis

a Lodoicea) in honor of Louis XIV. At the end of the 17th century, astronomers customarily referred to them as Enceladus, Enceladus, Titan, Titan and Titan. After the discovery of Mimas and Enseradus in 1789, the designation was extended to Iapetus. Discovered in 1848, Hyperion changed the numbering order for the last time, squeezing Iapetus to Iapetus.

Astronomer Johann Friedrich Wilhelm Herschel (son of Wilhelm Herschel and discoverer of Enceladus and Enceladus) later wrote in the Results of Ast

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s made at the Cape of Good Hope), which suggested that the seven satellites should be named after the Titans, which was later officially adopted.

Titan is made of ice, similar to Titan and Titan. It has a density of 0.97 g/cm3, indicating that Titan is almost entirely composed of water ice. The Titan sheet was badly impacted by celestial bodies and boasted many ice crevasses. It is one of the most reflective objects in the solar system, with a reflectivity of 1.229. This high reflectivity is due to Saturn's dim E-ring material, which also includes water ice ejected by Enceladus.

In Titan's surface temperature map, NASA scientists discovered the Pac-Man pattern. Two years ago, they also spotted this pattern in Enceladus's images, using data from Cassini's synthetic infrared spectrometer. Scientists' temperature differences may be different from those of surface material. In the image, areas with higher brightness may gain more heat.

There are 2 different terrains in Titan, one of which is made up of many potholes and the other is made up of dark volcanic belts. Such a crater means that Titan once had internal geological activity, causing ancient terrain to reappear on the surface.

The exact reason for the formation of this dark volcanic belt is unknown, but it may be explained by Galileo's photographs of Europa and Europa, which show bright ice caps in their polar regions due to ice deposits in craters that slope toward the poles. It could be a similar situation for Titan, where its polar regions are also fairly bright and have dark areas scattered around them. Titan's western hemisphere is dominated by giant pottered Odysseus, which has a diameter of 400 kilometers, which is close to the size of 2/5 of Titan. The crater is very flat, like the crater of Ganymede, without the towering craters and central bulges that are common to the Moon and Mercury. This is most likely due to a geological phenomenon caused by celestial impacts on the soft surface of Titan.

The 2nd main feature of Titan is the huge Ithaca Cha**a, which is 100 km wide and 3 to 5 km deep. It stretches for 2,000 kilometers and is about 3/4 of the circumference of Titan. Ithaca Canyon is thought to have been formed because the surface of Enceladus cracked as the liquid inside Titan solidified, causing it to expand in volume. The ocean below the surface may have caused Titan and Titan to form a 2:3 orbital resonance in the early days, which also led to internal tidal heating and orbital eccentricity. This ocean later froze completely after Titan broke away from this resonant relationship.

It is likely that all of the craters that formed before Titan was fully solidified were eliminated by subsequent geological activity. Astronomers have also proposed another theory to explain the formation of the Ithaca Canyon: the huge impact received during the formation of the Odyssey Crater caused a shock wave to spread throughout the Titan and cause the surface of the other side of the Titan to crack, forming the Ithaca Canyon. The surface temperature of Titan is -187 degrees Celsius.

Titan was discovered by Giovanni Domenico Cassini on March 21, 1684. At first, Cassini named the Iapetus, Titan, Titan and Titan he discovered "Side."

a Lodoicea) to flatter King Louis XIV of France, but the name was not universally accepted by astronomers. They called the first five moons of Saturn to be Enceladus. Later, after the discovery of Enceladus and Enceladus in 1789, this nomenclature was extended to Titan (today's nomenclature has since been adjusted, so it is different from that time).

In 1847 Johann Friedrich Wilhelm Herschel suggested that the names of the Titans in Greek mythology be used to name the moons of Saturn, so Titan received the name Diony. (In Greek mythology, Kronus was one of the Titans, and the Greek equivalent of Sartan in Roman mythology, according to the International Astronomical Association Saturn was named after Satan, so Saturn's moons were named after his siblings in Greek mythology.) ）

The average diameter of Titan is 1,118 kilometers. Titan is mostly made up of ice, but it is the third densest of Saturn's moons (1.5 g/cm3, with Enceladus and Titan being the first and second), so it must contain quite a bit of silicate rock inside.

Titan has an albedo of 0.55, which is darker compared to Titan and Titan. The surface temperature of Titan is -187°. Its rotation period is as long as the revolution period, which is also 65 hours and 41 minutes, so it rotates synchronously like the Earth's satellites. The angle of intersection between its axis of rotation and its axis of revolution is 0.006°.

Titan is a bit smaller than Titan, but very similar to Titan. They are similar in composition, reflectivity, and topography, with both satellites having very different fronts and backsides (the front side refers to the side that is flying in the direction of flight in the revolution, and the reverse side is the side that is carrying the direction of flight with its back in the revolution). The front of Titan has more impact craters and are brighter, while its reverse side is completely different, this side is darker, with bright, tiny stripes covering the craters above. This indicates that these stripes are relatively new. These streaks are estimated to be cliffs of ice. The geological formations found on Titan are: canyons, lines, and impact craters.

The origin of the bright line-like structure on the Cassini-Huygens probe, which flew by Titan on 13 December 2004, was unclear for one reason, in part because the only photograph of the structure that was taken up to that point was taken from far away. The only thing that was known at the time was that the composition of the structure was very reflective and very thin, because through it the underlying structure could be seen. The speculation at the time was that Titan had been geologically active when it had just formed, and that ice volcanoes had transformed much of the surface. These lines are formed along the cracks that erupt and snow fall back to the surface of Titan. Later, after these geological activities stopped, the front was wiped out due to the constant impact of meteorites.

But Cassini's latest photos prove that speculation incorrect. These lines are not piles of ice and snow at all, but bright ice cliffs created by the action of earthquakes. Titan's back shows a huge crack.

On October 11, 2005, Cassini flew over Titan only 500 kilometers from Titan and took clear photographs of the cliffs, some of which were hundreds of meters high.

Titan's surface has a variety of terrains, including terrain with many impact craters, plains with a moderate number of impact craters, plains with a few impact craters, and areas with fractured crust. The area containing many impact craters has many craters as large as 100 kilometers in diameter. Impact craters in plain areas are generally less than 30 km in diameter. However, there are also plains with many impact craters.

Most of the areas with many impact craters are located on the opposite side of Titan, and there are plains with a few impact craters in front of it. This phenomenon is the opposite of what many scientists predict. Eugene Shoemaker and others have theorized that autobiographically there should be more craters in front of a satellite that is synchronized with an orbital revolution and fewer in front of it.

This shows that Titan is hit by the opposite side of the front and tail. Due to Titan's relatively small size, it will be rotated when it is hit by a relatively large impact (the crater is greater than 35 km). Because there are many impact craters larger than 35 kilometers on the surface of Titan, it may be constantly turned when the impact rate is high in the early days. Today's impact craters and brighter frontal surfaces suggest that it has been frontal for billions of years.

Titan's impact crater is similar to Ganymede's, unlike the craters on the Moon and Mercury, where its edges are less pronounced. This may be due to the fading of the weaker ice over time. However, some of the impact craters on Titan also have a central mountain, rather than a complete absence of a central mountain like Callisto, suggesting that the ice on Titan is not as fragile as Callisto.

London, 2 Mar (Xinhuanet) -- University College London recently issued a communiqué saying that the NASA's Cassini probe project, in which researchers from the university participated, found that oxygen exists on Saturn's moon Titan, a discovery that supports the theory that some ice-covered planets can form oxygen under the action of cosmic rays.

According to reports, the "Cassini" probe flew over Titan in April 2010, and the plasma spectrometer it carried detected signs of oxygen ions on Titan. The plasma spectrometer was designed and built with the help of researchers at University College London, who analyzed the detection data with their peers and concluded that there was indeed a thin amount of oxygen on Titan.

This discovery allowed Titan to join the ranks of Saturn's "aerobic" moons, which had previously been observed to have found oxygen on Titan and a number of other Saturn moons. Professor Coates said that it is a relatively common phenomenon that ice-covered planets can form oxygen under the action of cosmic rays, and Titan is an example, its surface temperature is very low, covered with ice, and it is located in a more intense radiation, the rays hit the ice, causing it to break down into hydrogen and oxygen, where hydrogen escapes into space, and oxygen remains, forming a gas layer around Titan. But this layer of gas is so thin that it can't be called an atmosphere.

Because Titan's surface is covered by a large layer of ice, which is not suitable for life, although oxygen was found on Titan in this study, the researchers believe that life on the moon is unlikely.

According to the British Daily Mail, at present, the latest observations of the Cassini probe show that there may be an underground ocean in Titan.

Saturn's two moons, Enceladus and Titan, have previously confirmed the existence of a global ocean beneath the ice shell. Currently, the latest gravitational data from the Cassini probe as it flew by Saturn suggests that there is a huge ocean 100 kilometers below Titan's crust. The study was carried out by researchers from the Royal Astronomical Observatory of Belgium.

This vast ocean is thought to be tens of thousands of meters deep and surrounds the core of Titan rocks. It is reported that the Cassini probe was first launched in 1997 and first arrived in the Saturn system in 2004. Slightly larger than Enceladus, this moon is very similar, and previous studies have found that the south pole region of Enceladus spews huge streams of water vapor into space, and although Titan is relatively "quiet", researchers believe that its surface was more active in ancient times.