The study of meteorites found on Earth makes it possible . True monuments of origin Asteroids help scientists define the original composition in particular And especially nature and It enters the mixture of rocks and participated in our formation .
Formation of Rock Planets: Nebula or Chondrites?
Currently, the prevailing hypothesis regarding the formation of rocky planets is that these volatile elements were initially drilled in the solar nebula during the formation of young planets. At this point, the earth but others And they were just rock balls . Volatile components, etc. The I ‘ I ‘ And many more Rare, thus absorbed, dissolves into the sea Occupies their surface. Then, by These gases intensified and formed the atmosphere. The young planets were subjected to long and intense bombardment by so-called meteorites. », Which also participated in the contribution of volatile components. The evaporating elements of the meteorite contributed the most to the formation of the atmosphere, at least the terrain.
It is inferred from this hypothesis that the fusion of the oldest solar nebula or nebula-meteorite is mainly found at the level of the Earth’s inner layers. The superficial layers were subjected to intense melting process for billions of years . A new study, however, disrupts this way of thinking.
Meteorite testifying to the internal structure of Mars
Meteors that fall to Earth can come from many sources, including the surface of other rocky planets in the world. . The powerful impacts that affected the various planets early in their lives actually threw pieces of the planets into space, which constantly collided with neighboring planets. This is how fragments of Martian rocks were discovered on Earth. However, one of these meteorites has a certain value to scientists because it comes not from the surface, but from the interior of Mars, which is a very rare fact. This is about de Chassiny, discovered in France in 1815.
The team of researchers has studied the composition of this meteorite and especially the origin of its volatile components. Analysis of the isotopic ratios of krypton generally makes it possible to distinguish the solar or chondritic appearance of volatile elements. And the results of the study of the Chassigny meteorite are surprising to say the least.
In fact, isotopic analysis shows that the volatile elements in it do not come from the synthesis of the elements of the solar nebula as we think, but from the synthesis of chondritic substances. This suggests that at the time of the planet’s formation from the solar nebula, chondrites may have contributed much earlier than we thought to the contribution of volatile matter.
The situation may have been completely reversed, with the planet’s internal structure associated with the chondrites and the solar nebula of the atmosphere.
The atmosphere of Mars would have formed very quickly
Suggests that Mars’ atmosphere could not have been formed by gas emissions alone. , Which should contain a chondritic compound. By combining the elements of the solar nebula, the planet may have had its atmosphere before the magma sea cooled. It should be noted that Mars solidified very quickly in 4 million years Unlike Earth, it takes 50 to 100 million years to cool.
These new results suggest that Mars could have grown by the time the solar nebula collapsed due to the impact of radiation from young people..