The Moon's Mare referred to a flat terrain with few craters and looked black. It was made of black Mare Basalt and there was no liquid here. The lunar seas accounted for about 17% of the lunar surface area, and there were 22 of them on the surface of the moon. Except for the East China Sea, the Moscow Sea, and the Zhihai Sea on the back of the moon, the other 19 lunar seas were distributed on the front of the moon. There were many theories about the formation of the lunar ocean, such as nebula, magma, impact melting, volcanic activity, etc., but there was no conclusion yet. Research had proved that the materials in the lunar ocean were almost all made of heavy metals, which were rich in rare metals such as titanium, iron, Chromite, Zirconium, Yttriumum, and Besium.
The lunar sea was a flat terrain with few craters on the moon. It looked black and was made of black lunar sea magma. There was no liquid in it. There were a total of 22 lunar seas on the moon. Except for the East China Sea, the Moscow Sea, and the Zhihai Sea on the back of the moon, the remaining 19 lunar seas were distributed on the front of the moon, accounting for about 17% of the lunar surface area. In 1609, when the Italian scientist, Galilei, first observed the moon with a telescope, he speculated that there were many " dark " areas on the moon and named them " lunar seas." On the basis of the 1982 classification, the International Astronomical Union divided the lunar topography into three types: crater, lunar ocean, and lunar land. There were many theories about the origin of the lunar ocean, such as nebula theory, magma theory, impact melting theory, volcanic activity theory, etc., but there was no conclusive conclusion at the moment. Most of the Moon Seas were circular and enclosed, with a low elevation, flat terrain, and small changes in slope, just like a wide plain. Research had shown that the lunar ocean was almost entirely composed of heavy metals, and it was rich in rare metals such as titanium, iron, Chromite, Zirconium, Yttriumum, and Besium. In addition, Chang'e-6's research results showed that volcanic activity also existed on the back of the moon. This discovery helped to further understand the formation of the lunar ocean and the evolution of the moon.
There were many theories about the formation of the lunar ocean, such as nebula, magma, impact melting, volcanic activity, etc., but there was no conclusion yet. One view was that in the early days of the moon's formation, magma had flooded the surface, and a large amount of magma gathered in low-lying areas, laying a layer of magma at the bottom of the " pit," thus forming a lunar ocean. There was also a view that the Lunar Mare Basin on the Moon might have been formed by a huge impact and then filled with a large amount of lava erupting from the Moon's interior. Some craters in the Lunar Mare Basin were also covered by the erupting lava, forming a large-scale dark lava plain.
The main composition of the lunar ocean was the lunar ocean magma. Lunar sea basalts were the product of impact-magma eruption/overflow-cooling crystallization during the formation of large impact basins. They were mainly composed of plagioclases, augmenites, forster-rich olivine, and a small amount of minerals such as ilmenite and spinels.
At present, China has released an ultra-high-resolution three-dimensional map of the moon, but it did not mention whether the map was specifically drawn for the lunar ocean or the detailed presentation of the lunar ocean on the map. In addition, there was a 450-million-pel high-definition geological map of the moon. There was also no detailed information about the lunar sea map, so it was impossible to accurately provide the specific situation of the lunar sea map.
There were many theories about the formation of the lunar ocean, but there was no conclusive conclusion yet. One of the views was that some of the larger asteroids would break the moon's crust when they hit the moon, causing lava to flow out of the moon's mantle and cool down to form a lunar ocean. There were also nebula theories, magma theories, impact melting theories, volcanic activity theories, and so on.
The Moon Ocean was not the ocean on the moon. The lunar sea was a flat terrain with few craters on the moon. It looked black and was made of black lunar sea basalts. There was no liquid inside.
The lunar sea referred to the flat terrain on the moon with few craters and looked black. There was no liquid and it was made of black lunar sea magma. There were 22 lunar seas on the surface of the moon. Except for three on the back of the moon, the remaining 19 were distributed on the front of the moon, accounting for about 17% of the surface area of the moon (or about 25%). It was almost entirely made up of heavy metals, and it was rich in metals such as titanium, iron, Chromite, Zirconium, Yttriumum, and Besium. The Lunaette was also known as the Lunar Highland. It was an area on the surface of the Moon that was higher than the Lunar Sea. It was usually about 1 - 2 kilometers above the Lunar Sea. It was mainly composed of light-colored plagioclasite, which had a high degree of reflection to sunlight. It appeared white and shiny on the moon. The Lunaette was composed of the surface rocks, plagioclines, and materials that had been hit by meteorites in ancient times. It was brighter in color and older than the Moon Ocean. The density of the impact craters was higher. It was a very valuable astronomical observation target. The Lunaette was mainly distributed on the dark side of the moon. On the front side of the moon, its total area was roughly the same as the total area of the lunar ocean. On the dark side of the moon, the Lunaette's area was much larger.
The main differences between the Lunaette and the Moon Ocean were as follows: 1. ** Terrain **: - The lunar land was the area on the surface of the moon that was higher than the lunar sea. It was a highland terrain, generally about 1 - 2 kilometers above the lunar sea level. There were many topographic features such as mountains and valleys. The lunar sea was a low-lying area on the moon, mostly flat areas. 2. ** Appearance **: - The lunar land was mainly composed of light-colored plagioclasite, which had a high degree of reflection to sunlight. It looked bright and prominent on the moon. The lunar sea looked like a black plain terrain because it was composed of black lunar sea basalts, which appeared as a dark area on the moon's surface. 3. ** Dispersion **: - On the front side of the moon, the total area of the lunar land was roughly the same as the total area of the lunar sea, but on the back side of the moon, the area of the lunar land was much larger. There were about 22 lunar seas, except for three on the back side of the moon, the remaining 19 were basically distributed on the front side of the moon, and the lunar sea accounted for about 17% of the surface area of the moon. 4. ** Age of formation and crater density **: - The Lunaette was older than the Moon Ocean and had more craters. Its age was mainly between 4.5 billion and 4.25 billion years old, with some areas as low as 3.9 billion years old. The Moon Ocean was relatively young. 5. ** Material composition **: - The Lunaette was mainly composed of plagioclites, while the Moon Ocean was mostly composed of heavy metals, such as titanium, iron, titanium, and other metals.
The lunar ocean was a flat terrain with few craters on the moon and looked black. The lunar ocean was not a real ocean. There was no liquid in it, and it was made of black lunar ocean magma. There were 22 lunar seas on the surface of the moon. Except for the East China Sea, the Moscow Sea, and the Zhihai Sea, which were located on the back of the moon, the remaining 19 were distributed on the front of the moon, accounting for about 17% of the surface area of the moon. In 1609, when the Italian scientist, Galilei, first observed the moon with a telescope, he speculated that there were many " dark " areas on the moon's surface with water, so he named them " lunar seas." Based on the 1982 classification, the International Astronomical Union divided the lunar topography into three types: crater, lunar ocean, and lunar land. There were many theories about the origin of the lunar ocean, such as nebula theory, magma theory, impact melting theory, volcanic activity theory, etc., but there was no conclusive conclusion at the moment. Most of the Moon Seas were circular and enclosed. They were relatively flat and had a low elevation, and the slope had little change, just like a wide plain. Moreover, almost all the materials in the Moon Seas were made of heavy metals, which were rich in titanium, iron, Chromite, Zirconium, Yttriumum, Besium, and other metals.