Chapter 1851: Uranus

Chapter 1851 Uranus

At this time, Zhao Zhongyao looked at Feifei and said, "The eighth amethyst gem we are looking for is on Tianwei San." As long as we drive the spaceship and fly directly to Tianwei, we can find the eighth amethyst gem. '

After hearing what his father said, Feifei said, 'Okay, let's go to Tianwei San immediately! '

Tian Tian and Qu Yuqian also had no objections. As long as it is something Zhao Zhongyao and Feifei decide, they will not express any different opinions.

In this way, after Zhao Zhongyao and Feifei discussed it, they drove the spaceship to Tianweisan again. tv update is the fastest.biqugetv.()/ /

When flying to Tianweisan, Feifei asked Zhao Zhongyao to tell him some astronomical knowledge about Tianweisan.

‘Dad, since we are going to Tianwei now, can you tell us some knowledge about Tianwei first, so that we can learn more about this satellite of Uranus. Feifei looked at Zhao Zhongyao and said.

After hearing Feifei's words, Zhao Zhongyao said, "If you want to understand Tianwei III, you must first understand its parent planet-Uranus." Let me tell you something about Uranus first! '

After hearing what his father said, Feifei said again, "Okay, then tell us about Uranus first!" '

‘Okay, let me tell you about Uranus first. Zhao Zhongyao said so.

Next, Zhao Zhongyao told Feifei some knowledge about Uranus.

Uranus, one of the eight planets in the solar system, is the seventh planet from the inside to the outside of the solar system (18.37~20.08 AU). Its volume ranks third in the solar system (larger than Neptune), and its mass ranks fourth (smaller than Neptune). It orbits the sun almost horizontally. The cover image is a photo taken by Voyager 2 during its closest flyby of Uranus.

Uranus was the first planet discovered using a telescope. William Herschel discovered the planet in the courtyard of his home on March 13, 1781. Uranus and Neptune have interiors and atmospheres that differ from those of the more massive gas giants (Jupiter, Saturn), and astronomers have created a classification of ice giants to define them. Uranus has 27 known natural satellites, five of which are large, and 13 fainter rings.

The main components of Uranus' atmosphere are hydrogen, helium, methane and deuterium. It is speculated that its interior may be rich in heavy elements. The mantle consists of ices of methane and ammonia, and may contain water. The inner core is composed of ice and rock. Uranus is the planet with the coldest atmosphere in the solar system, with a minimum temperature of 49K (-224c)

Uranus is mainly composed of rocks and water ice substances of various compositions, the main element of which is hydrogen (83), followed by helium (15). In many respects Uranus (as is Neptune) is different from Jupiter and Saturn, which are mostly composed of gaseous hydrogen, and its properties are closer to the core parts of Jupiter and Saturn, without the huge liquid gas surface surrounded by Jupiter-like planets.

The mass of Uranus is about 14.5 times that of the Earth, making it the least massive of the Jupiter-like planets. Its density is 1.29 g/cm3, which is only a little higher than that of Saturn. Although its diameter is similar to that of Neptune (about 4 times that of Earth), its mass is lower. These values ​​show that Uranus is mainly composed of various volatile substances, such as water, ammonia and methane. The total content of ice in the interior of Uranus is not yet known precisely, and it varies according to the selected model, but it is always between 9.3 and 13.5 times the mass of the earth. Hydrogen and helium only account for a small part of the total, about 0.5 to 1.5 Earth masses. The remaining mass (0.5 to 3.7 Earth masses) is rocky material.

The Standard Model structure of Uranus consists of three layers: a rocky core in the center, an icy mantle in the middle, and a hydrogen/helium outer shell. In contrast, the core is very small, only 0.55 Earth's mass, and the radius is less than 20 Uranus; the mantle is a huge thing, with a mass about 13.4 times that of the Earth; and the outermost atmosphere is relatively indeterminate, extending about Occupying the radius of the remaining 20, but only about 0.5 times the mass of Earth.

The density of the Uranus core is about 9g/c, the pressure at the junction of the core and the mantle is 8 million bars and the temperature is about 5000K. The icy mantle is not actually composed of ice in the usual sense, but a hot, dense fluid of water, ammonia, and other volatile substances. These fluids are highly conductive and are sometimes called water-ammonia oceans. The bulk structure of Uranus and Neptune is quite different from Jupiter and Saturn, with more ice than gas, so it is reasonable to separate them into another category as ice giants.

The models considered above are more or less standard, but other models can also satisfy the observed results. For example, if large amounts of hydrogen and rock were mixed in the mantle, the total amount of ice would decrease and the relative total amount of rock and hydrogen would increase; the data available were not enough for us to confirm which model is correct.

The fluid structure of Uranus' interior means that there are no solid surfaces, and the gaseous atmosphere is gradually transformed into a liquid interior. However, in order to facilitate the rotation of the oblate spheroid, when the atmospheric pressure reaches 1 bar and is defined as the surface of the planet, the equatorial and polar radii of Uranus are 25559±4 and 24973±20 kilometers, respectively. Such a surface will serve as the zero point for height in this article.

Uranus has 27 known natural satellites named after characters from operas by William Shakespeare and Alexander Pope. The names of the five main satellites are Obelisk, Obelisk, Obelisk, Obelisk and Obelisk. Obelisk and Obelisk were the first and second Uranus discovered by William Herschel on March 13, 1787

The satellites, Alma and Alma, were discovered in 1851 by William Russell.

But it wasn't until 1852 that William Herschel's son, John Herschel, named the four moons. In 1948, Gerald Kuiper discovered the fifth satellite, Ariel. The Uranian satellite system is the least massive of the gas giants, with the combined mass of the five major satellites being less than half that of Triton.

The radius of the largest satellite Tiansan is only 788.9 kilometers, which is less than half of the moon, but slightly larger than Saturn's second largest satellite Rhea. The albedo of these satellites is also relatively low, about 0.2 for Alma and 0.35 for Alma. These moons are composed of ice and rock, about 50% ice and 50% rock, the ice may contain ammonia and carbon dioxide.

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.