AssignmentsAnd interplanetary probes, launched in the 1970s, were able to broadly confirm a scenario of planets and exoplanets forming in previous decades. A Rich And dust around a young About 4.56 billion years ago.
Futura has devoted several articles to this debate, and today brings a new section to it via In an article . It reports some conclusions from the analysis of the samples Earth was reported by the end of 2020 by a Japanese probe . These models come from (“Dragon Palace”, in Japanese), belongs to the Apollo family of meteorites, the C type. It is found on Earth and is located 300 million kilometers from our planet.
Less than 900 meters in diameter, examination of these samples confirmed that they contain raw material derived from the period of their formation. And it’s little changed despite traces of heat and water circulation But its temperature should not exceed 30 degrees Celsius.
Hydrogen isotopes as cosmogonic tracers
To understand what it is, remember that naturally there are two types of water, one, normalof H with single to the center; The other, called heavy, is made up of deuterium D atoms, so one proton and a .
became part of the water on earthA hydrogen atom is replaced by deuterium. We can thus define the T/H isotopic ratio of origin of seawater in cosmochemistry.
A study of meteorites on Earth—mostly from the main asteroid belt—was able to establish that, on average, the D/H ratio was on the order of 140.Whereas this ratio, when determined in some comets, was between 150 and 300 ppm. On Earth it is about 150 ppm, the comet hypothesis is negative, or at least, comets are not the main source of Earth’s water.
Ryuku’s analyzes therefore support the asteroid hypothesis.
The Solar System is a laboratory for studying the formation of giant planets and the origin of life, which can be used in conjunction with the rest of the observable universe for the same purpose. Mojo: Modeling the origin of the Jovian planets, namely modeling the origin of the Jovian planets, is a research project that has resulted in a series of videos presenting the theory of the origin of the Solar System, and in particular the origin of the gas giants, by two renowned experts, Alessandro Morbidelli and Sean Raymond. Click on the white rectangle in the lower right for a more accurate French translation. Then the English subtitles should appear. Then click on the nut to the right of the rectangle, then “Subtitles” and finally “Auto Translate”. Select “French” © Laurence Honnorat