Une célèbre image de la Terre et de ses océans prise par les astronautes d'Apollo 17. © Nasa

The water of the oceans would come from asteroids, according to a new study

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The Missions The Apollo Space Program
Apollo is an American space program for manned exploration of the moon, which was decided in 1961 by American President John Fitzgerald Kennedy.
The aim of the…” data-image=”https://cdn.futura-sciences.com/buildsv6/images/midioriginal/b/7/5/b7563ef6d1_50084103_apollo11.jpg” data-url=”https:/ / news .google.com/sciences/definitions/universe-apollo-3743/” data-more=”Read more”>Apollo and the interplanetary probes launched in the 1970s allowed broad confirmation of a scenario worked out in previous decades that led to planet formation and comets in a Recent studies tend to show that brown dwarfs, even smaller celestial objects called “planemos”, are also surrounded by a protoplanetary disk.” data-url=”https://news.google.com /sciences/definitions/universe – protoplanetary-disk-4444/” data-more=”Read the definition”>protoplanetary disk high in gas and dust surrounds a young The Sun is the closest star to Earth, from which it is about 150 million kilometers away. The Sun is 8.5 kParsecs from the center of the Milky Way. In the stellar classification, the Sun is a G2 type star.
The mass…” data-image=”https://cdn.futura-sciences.com/buildsv6/images/midioriginal/1/d/9/1d9cd1d45f_50034577_eruption.jpg” data-url=”https://news. google.com/sciences/definitions/univers-soleil-3727/” data-more=”Read more”>Sun about 4.56 billion years ago.

This scenario brings out and grows the rocky planets like the earth mercury or March over accretionwith a bombardment ofasteroids and comets, traces of which can still be found in the form of lunar craters. The water in Earth’s oceans must have come from this bombardment, but debate over the precise nature of the small celestial bodies responsible for this contribution has continued for decades. In other words, the water mainly comes out comets or asteroids?

Futura has devoted many articles to this debate and today a new article was brought to it above an article at natural astronomy. It reports certain results from the analysis of samples of organic matter, nitrogenous matter, etc.
There are different families like:

organic matter representing living beings (animal or plant) or…” data-image=”https://cdn.futura-sciences.com/buildsv6/images/midioriginal/e/7/0/e70ccaaf4a_91935_matiere. jpg” data-url=”https://news.google.com/sciences/definitions/matiere-matiere-15841/” data-more=”Read more”>matter Reported to Earth by the Japanese probe in late 2020 Hayabusa-2. These samples are from the asteroid Ryugu (“Dragon Palace”, in Japanese), a member of the Apollo family of asteroids, of type C because of composition similar to chondrites found on Earth, and which is more than 300 million kilometers from our planet.

Measuring less than 900 meters in diameter, examination of its samples confirmed that it contained original material resulting from the formation of the solar system and which, despite traces of heating and water circulation, had been little altered liquid whose temperature must not have exceeded 30°C.

Hydrogen isotopes as cosmogonic tracers

Cosmochemists examine samples from Ryugu declare today that the analyzes of Rich in hydrogen and nitrogen isotopes reiterate the relationship between the water of asteroids and that of the oceans on Earth.

To understand what it is, remember that there are of course two types of water, one of which is ordinaryatoms General
Symbol: H Atomic number:…” data-image=”https://cdn.futura-sciences.com/buildsv6/images/midioriginal/3/8/8/38807f95a1_50010101_equinoxprom-eit-big.jpg” data-url = “https://news.google.com/sciences/definitions/chemistry-hydrogen-14495/” data-more=”Read more”>hydrogen H with a single proton for core; the other, called heavy, consists of deuterium D atoms, i.e. a nucleus with a proton and a It is not an elementary particle, just like the proton, because it consists of…” data- image=”https: // cdn.futura-sciences.com/buildsv6/images/midioriginal/1/5/5/15590279f6_71819_atome.jpg” data-url=”https://news.google.com/sciences/definitions/physics-neutron-3498 /” data-more=”Read more”>neutron.

A fraction of the water on Earth consists of what is known as a single covalent bond…” data-image=”https://cdn.futura-sciences.com/buildsv6/images/midioriginal/d/0/e /d0e3dc7e1e_76472_molecule .jpg ” data-url=”https://news.google.com/sciences/definitions/chemistry-molecule-783/” data-more=”Read more”>molecules Contain deuterium instead of a hydrogen atom. We can therefore define a D/H isotope ratio, which in cosmochemistry is an indicator of the origin of seawater.

By comparing this relationship with that found in meteorites and comets, it is therefore possible to ascertain which were the parents of the waters of the oceans. For years, the thesis of an origin of this water has been going around Volcanic outgassing of the young earth was abandoned and the pendulum has not stopped tipping alternately either to the side of the comets or to the side of the meteorites.

The study of meteorites on Earth, coming mainly from the main asteroid belt, has made it possible to establish that the average D/H ratio was of the order of 140 ppm while for certain comets this ratio ranged from 150 to 300 ppm. Since it’s about 150 ppm on Earth, the comet hypothesis has been disproved, or at least comets would be far from the main source of water on Earth.

Ryugu’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 that can be used in conjunction with the rest of the observable universe for the same purpose. MOJO: Modeling the origin of JOvian planets, ie the modeling of the origin of the Jupiter 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 of the gas giants by two renowned specialists, Alessandro Morbidelli and Sean Raymond. For a fairly accurate French translation, click the white rectangle at the bottom right. Then the English subtitles should appear. Then click on the nut to the right of the rectangle, then on “Subtitles” and finally on “Translate automatically”. Choose French © Laurence Honnorat

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