Cosmic catastrophe defined shape and composition of the young Earth
Scientists have explained why the composition of the Earth is so similar to the composition of the silicate meteorites - and still do not like them.
By submitting new space missions to distant asteroids, leading the search for meteorites fell to Earth, astronomers like to explain: "It will allow us to look into the past of the solar system and our planet." Readers are often left at a loss, although the idea here is simple enough. It is shown that asteroids were formed about the same time far as the planets. However, unlike the planets billions of years of their lives they were boring. Asteroids (those that remain) are not faced with other bodies, they were not active geological and tectonic processes even more. They do not have hot core - all the chemicals of the early Solar System preserved them almost intact.
It is believed that the young buds of the Earth, mostly served as an ancient class of meteorites chondrites - the most common, and consist mainly of silicates. Indeed, the isotopic composition of elements constituting chondrites, close to the isotopic composition of our planet. But here's the rub: the content of silicon, potassium, sodium and they are much higher, but the world more magnesium, calcium and aluminum. This inconsistencies long time could not explain.
American scientists have put a series of laboratory experiments in which the samples were subjected to different pressures chondrites, simulating the formation of the young planet. Radioactivity and, most importantly, the heat from the shock colliding bodies is heated it was melted and stirred. Heavier elements gradually fell closer to the center, and gradually formed the iron-rich core. These events have also studied in the laboratory at this chondrites example, showing that the crust is formed as a result of the same composition as meteorites themselves.
The difference, according to them, there is because of the new bombing young bark. Part of it after such attacks provided ejected into space. Heat is converted to dust and gas magnesium, aluminum, calcium, sodium, etc. - But calcium, magnesium and aluminum quickly settled back, whereas the remaining elements left Earth. However, the very nature of the bombing remains unclear. When it happened? What was the planet colliding with the body and what caused their appearance near the Earth? It remains to find out.
Scientists have explained why the composition of the Earth is so similar to the composition of the silicate meteorites - and still do not like them.
By submitting new space missions to distant asteroids, leading the search for meteorites fell to Earth, astronomers like to explain: "It will allow us to look into the past of the solar system and our planet." Readers are often left at a loss, although the idea here is simple enough. It is shown that asteroids were formed about the same time far as the planets. However, unlike the planets billions of years of their lives they were boring. Asteroids (those that remain) are not faced with other bodies, they were not active geological and tectonic processes even more. They do not have hot core - all the chemicals of the early Solar System preserved them almost intact.
It is believed that the young buds of the Earth, mostly served as an ancient class of meteorites chondrites - the most common, and consist mainly of silicates. Indeed, the isotopic composition of elements constituting chondrites, close to the isotopic composition of our planet. But here's the rub: the content of silicon, potassium, sodium and they are much higher, but the world more magnesium, calcium and aluminum. This inconsistencies long time could not explain.
American scientists have put a series of laboratory experiments in which the samples were subjected to different pressures chondrites, simulating the formation of the young planet. Radioactivity and, most importantly, the heat from the shock colliding bodies is heated it was melted and stirred. Heavier elements gradually fell closer to the center, and gradually formed the iron-rich core. These events have also studied in the laboratory at this chondrites example, showing that the crust is formed as a result of the same composition as meteorites themselves.
The difference, according to them, there is because of the new bombing young bark. Part of it after such attacks provided ejected into space. Heat is converted to dust and gas magnesium, aluminum, calcium, sodium, etc. - But calcium, magnesium and aluminum quickly settled back, whereas the remaining elements left Earth. However, the very nature of the bombing remains unclear. When it happened? What was the planet colliding with the body and what caused their appearance near the Earth? It remains to find out.
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