On the afternoon of the sixth day, Hua Feng and the others learned that a team of scientists involved in the Cassini project had claimed that the equatorial ridge was a remnant of the oblate-shaped star of the early formation of Titan, which at that time rotated much faster than it does today. The height of the equatorial ridge suggests that its shortest rotation period may have been 17 hours.

If Titan had to cool fast enough for the equatorial ridge to be preserved, while remaining malleable enough for long enough to be able to maintain its plasticity – long enough for Saturn's tidal action to slow down Iapetus' rotation and eventually bring its rotation period to 79 Earth days – then Titan would need the isotope decay of Aluminum-26 to heat it up.

This isotope was found in the nebulae of the early solar system, but it is estimated that it was depleted in the early days of the formation of the solar system. To have the amount of aluminum-26 isotopes needed to heat Titan, Iapetus would have to form earlier than expected – 2 million years after the asteroid began to form.

It has also been suggested that in the early days of formation, the Hull space on Titan (Hill Sphe

e) The area has formed a ring system, which later formed the present equatorial ridge due to the partial collapse of the ring system. However, the equatorial ridge, which appears to be very solid, does not appear to be caused by this collapse effect. In addition, recent observational images show a faulted structure that runs through the equatorial ridge, a phenomenon that seems to contradict the collapse ring hypothesis.

The surface temperature of the dark-sided equatorial region reached 130 degrees Kelvin, which was partly due to Titan's long rotation period. The bright side absorbs less sunlight, so the temperature only reaches 100 degrees Kelvin.

There is something slightly unusual about Titan's orbit. Although it is Saturn's third largest moon, it is very far from Saturn's second farthest moon, Titan. At the same time, it has the largest orbital inclination among regular satellites, and only the outer irregular satellites, such as Titan, have a greater orbital inclination. The cause of this phenomenon is unknown.

Due to its distance and large orbital inclination, Titan is the only large moon with a clear view of Saturn's rings, while the other inner moons are facing the edge of Saturn's rings, making it difficult to observe. Viewed from Titan, Saturn's viewing angle reaches 1°56' (four times the viewing angle of the Moon as observed from Earth).

Cassini has repeatedly observed and photographed Iapetus from medium distance. However, due to its orbit, it is difficult to make close-up observations. On 10 September 2007, Cassini made a close flyby 1,227 kilometers away.

Scientists at NASA recently (October 8, 2009) discovered the existence of an "invisible" huge ring around Saturn (pictured), which can hold 1 billion Earths.

NASA's Jet Propulsion Laboratory said the ring plane is at a 27-degree inclination to Saturn's main ring, and the inner side of the ring is about 5.95 million kilometers away from Saturn and about 11.9 million kilometers wide. Its diameter is equivalent to 300 times the diameter of Saturn. It can hold 1 billion Earths.

"It's a super aura. Anne Warbitser, an astronaut at the University of Virginia, said the halo is made up of particles of ice and dust that are so far apart that "you can't see clearly even if you stand on it." In addition, Saturn receives very little sunlight and even less visible light from its rings, making it difficult to spot.

The dust that makes up the aura has a very low temperature of -193°C, but it emits thermal radiation. NASA's Spitzer Space Telescope captured this thermal radiation and discovered this massive halo.

The second theory is caused by the small satellite Titan. Some people say that Titan is extremely low-density. That's right,

Countless debris drifted away after Titan was hit by an asteroid, and Titan and Titan orbited almost the same, and the debris flew towards Cassini's zone, forming a yin and yang face.

The orbit of Saturn's moon "Phoebe" passes through this ring. Scientists believe that the ice and dust inside the ring came from a collision between Phoebe and a comet.

The discovery of the rings may help explain an old and mysterious question about Saturn's other moon, Titan. Astronomer Cassini first discovered Titan in 1671, saying that the planet is black on one side and white on the other, like a Tai Chi symbol. The newly discovered halo rotates in opposite orbit to Iapetus. Scientists speculate that dust within the halo splattered onto the surface of Iapetus, forming a black ** domain.

"Astronauts have long believed that there is a connection between Phoebe and the black material above the surface of Titan, and the newly discovered aura provides convincing evidence for this. Douglas Hamilton, one of the discoverers of the new halo and an expert at the University of Maryland, said.

Titan is the only retrograde moon in the Saturn system, also known as Phoebe, which orbits Saturn. It rotates in the opposite direction to Saturn's rotation. Since Titan rotates in the opposite direction to Saturn, Saturn will appear to rotate extremely fast on Titan, and it seems that Saturn will rotate once in less than 5 hours, which is more than twice as fast as Saturn's actual rotation.

Titan orbits Saturn in about 1.5 years, but its rotation period is only 9 to 10 hours, and on Titan you will see Saturn, the Sun and other stars rising in the west and setting in the east in less than 5 hours. Titan is not large, only about 200 kilometers in diameter, spherical, and 12.95 million kilometers away from Saturn, so the Saturn seen on Titan is very small, about the same size as the moon we see.

Cassini took a series of stunning, high-resolution images of Titan on his way to Saturn, revealing the scarred surface features of the little moon. There is plenty of evidence that this small body is composed mainly of ice and is covered with a layer of dark material only 300,500 meters thick.

Titan's surface is covered with craters of all sizes, with bright streaks on the walls of the largest crater, bright rays emitted by smaller craters, and inexplicable troughs scattered throughout the image. The images sparked a heated debate among scientists, who noted the difference between the surface of Titan and other rocky asteroids, such as Ida, Marcel and Eros, whose craters do not have as many bright spots or streaks as Titan.

As a result, more scientists tend to accept the notion that Titan may have been an object in the outer solar system, such as a comet or Kuiper belt. The topography can also be seen from the highest-resolution images to understand the internal structure of Titan, a world full of distinctive topographical features, full of craters, many landslide structures, and many linear terrain features, such as trenches and clusters of craters.

Scientists are taking a closer look at these structures in hopes of better understanding Titan's origin and evolution. All these images suggest that Titan is likely to be captured by Saturn's strong gravitational pull after intruding into the inner solar system 4 billion years ago, but the final conclusion still needs to be determined by scientists using 11 different scientific instruments on the Cassini probe to comprehensively analyze the surface structure, quality and chemical composition of Titan.

Some scientists believe that the moon was originally a foreign "guest" and not Saturn's "own flesh and blood". Perhaps in the early days, a comet nucleus occasionally broke into the vicinity of Saturn, was captured by Saturn, and became a member of the Titan family.

Titan (Phoebe): Phoibe, goddess of knowledge, Ou

a

os) and the daughter of the earth god Gaia, the titan god Tita

s).

Most of Saturn's moons are bright, but Titan has an albedo of only 0.05, which is as dark as soot.

With the exception of Titan and Titan, all of Saturn's moons orbit the same as Saturn's equatorial plane. Titan is tilted at an angle of nearly 175 degrees (its north pole is exactly opposite to Saturn).

Titan's eccentric, retrograde orbit and unusual albedo suggest that it may have been a captured asteroid or an object in the Kuiper Belt.

Titan's unusualness is also manifested in its asynchronous rotation, unlike other Saturn's moons except Titan.

The material falling from Titan may be related to the darkness of the surface of Titan and the reverse rotation hemisphere of Titan due to subtle meteoroid impacts. Data obtained by the Cassini probe from its flyby of Saturn on June 11 last year suggests that, unlike Saturn's other moons, Titan has a lower ice content and a higher rock content, so that the ice-rock ratio is more similar to the remains of the solar nebula.

In addition, some minerals and organic molecules on the surface of Titan are connected to the Kuipe belt, which is several billion kilometers away from the Earth, beyond Neptune's orbit

Belt). In 1951, astronomer Kuiper proposed that beyond Neptune, there was a group of icy stars arranged in a band, the existence of which had been confirmed by previous scientific explorations.

Scientists point out that the evidence suggests that Titan, which is about 200 kilometers in diameter, actually came from the cold edges of the solar system, rather than forming in the dry, hot interior of the solar system. Due to the huge gravitational pull of the planets, some objects in the Kuiper Belt are directed towards the Sun, and scientists have discovered more than 700 similar objects so far, and Titan was captured by Saturn during the flight to the Sun.

Previously, scientists had suspected that Titan was an outsider to the Saturn system, because it orbited around Saturn in the opposite direction to other Saturns, and its orbit was at a very large angle to Saturn's equator. The study confirms the hypothesis that Titan is not a moon of Saturn. Experts believe that the study of Titan can provide further understanding of how the solar nebula formed planets.

It was discovered in 1966 by the French astronomer Doui

Dollfus). Dollfus is credited with discovering Titan, but this is not certain. It is uncertain whether the object he sees is Titan or Titan, and his observations have gone into a wrong orbit. (The Walker discovered it independently, but its telegram arrived a few hours later than Dollfus's) Alas

so

and Fou

tai

In 1978, it was determined that there were in fact two moons about 151,000 km above Saturn. This was confirmed by Voyager 1 in 1980.

Titan and Titan are binary stars, with orbits only 50 kilometers apart, less than the radius of either of them. Their orbital velocities are approximately equal. The low, fast one will slowly catch up with the other, and as they get closer to each other, they exchange some momentum. This eventually results in the lower one rising to a high orbit and the higher one lowering to the lower orbit. And so they swapped places. This transition occurs every four years, and the orbital data given here is measured by Voyager that year.

Titan is widely believed to have craters (craters) larger than 30 km, but rarely has a rectilinear physiognomy. On the surface, it looks older than Titan, but younger than Titan. Second, Titan is full of large craters, but there are no small craters. One of the possible explanations is that the surface of the satellite is covered with a layer of dust.