Scientists have found what looked like a «germ» of the planets of the Solar system

© University of Copenhagen/Lars BuchhaveПротопланетный gas-dust disk around the starScientists have found what looked like a «germ» of the planets of the Solar system© University of Copenhagen/Lars Buchhave

The first asteroids and the «germ» of the planets in our Solar system were more like balls of semi-liquid mud, not on the rocky celestial body in the first moments of his life, according to a paper published in the journal Science Advances.

«Understanding how did the asteroids that will allow us to find out how it arose and evolved organics in the Solar system, and will help us to look for traces of life beyond. All this will help us to create more complex and complete model of where to look for habitable worlds around other stars,» said Philip bland (Bland, Philip) from Curtin University in Perth (Australia), whose words reports the magazine New Scientist.

The solar system was born around 4.4 billion years ago, along with our Sun. As scientists believe, the Earth and three other planets in its inner part were born in the collision of rocky protoplanetary bodies that were completely deprived of water due to the fact that the light of the young Sun destroyed or vaporized all the ice reserves in the «warm» part of the protoplanetary disk, extending in fact to the current orbit of Jupiter.

For this reason, scientists today are most actively discussing on two interrelated things: when and where did this «primary» water and where the water subsequently undertook on Earth, Mars, and presumably Venus. And the one and the other question there is no definitive answers, but scientists are actively trying to solve them, by studying the composition of comets and ancient meteorites.

Bland and his colleagues found an unexpected answer to this question, trying to create in the virtual space analogue of the primordial matter of the Solar system and «blind» from it simplest prototypes of the «germ» of the planets and large asteroids that inhabited the vicinity of the Sun in a while.

As he says, almost nobody paid attention and not tried to calculate how the presence of water and sources of heat in the gas-dust disk, the birthplace of the first «germ» of the planets will affect the device behavior and the first major «inhabitants» of the Solar system.

Calculations of bland and his colleagues show that soft and loose primary matter of the Solar system could not immediately turn into a solid rocky body, similar to the present asteroids and meteorites. The first «germ» of the planets were like balls of relatively soft dirt that was born thanks to the melting of ice by heat produced by the decay of radioactive elements in the inner layers of these balls.

The dirt began to «boil» and gradually dump heat into space just as the water in the kettle moving from the bottom to the top and back. On the other hand, the mud was too thick to insoluble particles of minerals could «drown» and accumulate in deep layers of mud asteroids, so their chemical composition remains homogeneous.

Subsequently, these «mud balls» gradually turned into stone, increasing their mass and density. Such a scenario, according to bland, well explains many oddities in the chemical composition of the most primitive asteroids of chondrites, over which scientists scratching their heads for over half a century. For example, it is well explains why matter is the most ancient and «pure» meteorite has traces of very active interaction with water, despite the absence of noticeable changes in the chemical composition.

As noted by geologists, validation of this hypothesis will be possible in the near future probe «Hayabusa-2» will arrive to the asteroid Rugy, the analogue of such meteorites about a year, and get a sample of matter, the analysis of which will help to understand whether the Solar system is inhabited by these «mud balls» in the days of its birth or not.


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