Chapter 1852: Tianwei III
Chapter 1852 Tianwei III
Zhao Zhongyao looked at Feifei and told him something about Uranus. After Feifei heard this, he had a general understanding of this gas giant planet in the solar system.
After listening to Zhao Zhongyao's knowledge about this gas giant planet Uranus, Feifei looked at Zhao Zhongyao again and said, "Dad, I have already learned about this Uranus, so let's continue." Come down, shouldn't you also tell us about Tianwei San, don't we just go to Tianwei San now! '
After hearing Feifei's words, Zhao Zhongyao said, "Okay, since you still want to know about Tianwei San, then I will tell you something about Tianwei San!" '
Next, Zhao Zhongyao told Feifei some knowledge about Tianweisan.
Atelier, also known as Uranus III, is the largest moon of Uranus and the eighth largest moon in the Solar System. 1,578 kilometers (981 miles) in diameter. Discovered by William Herschel in 1787, Bethias is named after the Fairy Queen from Shakespeare's A Midsummer Night's Dream. It orbits within Uranus' magnetosphere.
Beta is composed of approximately equal amounts of ice and rock, and may have differentiated into a rocky core and an icy mantle. A liquid water ocean may exist at the core-mantle boundary. Beta's relatively dark, reddish surface appears to have been shaped by impacts and endogenous tectonic processes.
It is covered in numerous impact craters, up to 326 kilometers (203 miles) in diameter, but not as severely cratered as Diana, the outermost of Uranus' five large moons. Beta may have undergone an early endogenous surface regeneration event, covering its older, pitted surface.
A vast system of canyons and cliffs cuts into Utalys' surface, the result of its interior expanding during later development. Like all of Uranus' major moons, Beta may have accreted from an accretion disk after Uranus formed.
Infrared spectroscopy studies conducted in 2010 revealed the existence of water ice and carbon dioxide dry ice on the surface of Beta, which may contain a weak carbon dioxide atmosphere with a surface pressure of about 10 nanopascals. Measurements during the three occultations of Celestia were at 1–2 NaPa, setting the surface pressure of any possible atmosphere as an upper limit.
Tianwei is the largest satellite of Uranus in terms of volume and mass, and the eighth most massive satellite in the solar system. Beta's density is , much higher than is typical for Saturn's moons, suggesting that it consists of roughly equal proportions of water ice and a dense non-ice component; the latter can be rocky and carbon-based material including heavier organic compounds.
Years of infrared spectroscopy observations have shown that crystallized water ice exists on the surface of its satellites. The water ice absorption band in the co-orbiting hemisphere of Tianshen is slightly stronger than that in the anti-orbiting hemisphere. This is in contrast to what has been observed on Atalis, whose anti-orbiting hemisphere exhibits a stronger signature of water ice.
The reason for this asymmetry is unknown, but may be related to the bombardment of charged particles from Uranus' magnetosphere, stronger in the anti-orbiting hemisphere (due to the co-rotation of the plasma). The energetic particles tend to sublimate water ice, breaking down methane trapped in the ice to form hydrates and darkening other organic matter, leaving a dark, carbon-rich residue surface.
In addition to water, the other compound identified on the surface of Beta by infrared spectroscopy is carbon dioxide, mainly concentrated in the anti-orbiting hemisphere. The origin of carbon dioxide is not fully understood. It may have arisen from local carbonates, or it may have been organic matter affected by the sun's ultraviolet radiation or energetic charged particles from Uranus' magnetosphere.
The latter process could explain the asymmetry in its distribution, since the anti-orbiting hemisphere is more affected by the magnetosphere than the co-orbiting hemisphere. Another possible source is the release of previously trapped CO2 by the water ice inside early Beta, which may be related to past geological activity on this moon.
The interior of Beta may have differentiated into a rocky core surrounded by an icy mantle. If this were the case, the core radius would be 520 km (320 miles), about 66% of the satellite's radius, and its mass would be about 58% of the satellite's mass, depending on the mass composition of the satellite.
The pressure at the center of Beta is about 0.58 GPa (5.8 kilobars), and the state of the icy mantle is unknown. If the ice contains enough ammonia or other antifreezes, Beta may have a subsurface ocean at the core-mantle boundary that can be as thick as 50 kilometers (31 miles) thick and at a temperature of about 190K. The present-day internal structure of Beta depends largely on its thermodynamic history, which we know very little about.
Zhao Zhongyao looked at Feifei, and then told him some knowledge about Tianweisan. After Feifei heard this, he had a general understanding of this mysterious Beta.
At this time, Feifei looked at Zhao Zhongyao and said, "Dad, let's go to this Tianwei San to take a look!" '
'Okay, we'll go up to Tianwei in a moment. After Zhao Zhongyao finished speaking, he accelerated the speed of the spacecraft, and they quickly flew over Tianweisan.
Tianwei is the largest satellite of Uranus and the eighth largest satellite in the solar system. The entire Tianwei three can be said to be full of ravines. It is a planet with very complex terrain composed of many grand canyons and basins.
When the spacecraft flew over Tianweisan, Feifei looked at Zhao Zhongyao again and said, 'Dad, where should we go to find the eighth amethyst gemstone now. This eighth amethyst gem must be on Tianwei San! '
After hearing Feifei's words, Zhao Zhongyao said, "According to the instructions on the star map, the eighth amethyst gemstone is on this three-star celestial satellite." Since the star cluster said so, it must be on this planet. '
It’s just that Feifei said helplessly after hearing Zhao Zhongyao’s words, ‘Dad, where should we go to find the eighth amethyst gemstone. I see this Obelisk, everywhere
They are full of gullies, and there may be an eighth amethyst gem hidden there. '
After hearing Feifei's words, Zhao Zhongyao said, "Judging from the experience of the amethyst gemstones we were looking for before." The places where amethyst gems are hidden are in the Grand Canyon or the Great Basin of some planets.
We are now looking for the eighth amethyst gem on Tianweisan, and of course we have to look for it in some grand canyons and basins. '
It’s just that Feifei listened to what his father said, and said again, ‘But there are countless canyons and basins on Tianweisan, which canyon or basin should we go to find first. '
After hearing Feifei's words, Zhao Zhongyao said, "Since the amethyst gemstones we found before are usually in some basins." Then let's find a big basin first! '