Earth's water is not imported

Now, a group of researchers from the United States, Canada and the United Kingdom, led by Carnegie Institution researcher Conel Alexander, have added a new piece to the puzzle about the origin of life. In a study published in the journal Science, they suggest that they were meteorites and asteroids and not the ones that fertilized the Earth. And also, it brings the origin of water to the asteroid belt and not beyond the orbit of Jupiter, as it has been considered up to now.

As explained by the researcher of the Institute of Space Sciences (CSIC-IEEC) Josep María Trigo, "the most probable hypothesis is that the organic matter and in particular the water of the Earth come from the fall of those objects". Scientists believe that these bodies formed in outer zones of the Solar System, but at a given moment they were dragged into the system with a migration approach to the Sun of Jupiter and Saturn, which had also grown beyond their current orbits . "In this final period of the accretion [process of formation of the planets], during that late bombardment stage, the atmosphere of the Earth was enriched with water and organic compounds," says Trigo. This "external" origin of many of the elements of our atmosphere is sustained, for example, in the similarities between Titan and Earth. A study by Trigo and F. Javier Martín Torres of the Center for Astrobiology (CSIC-INTA) showed similarities in their atmospheres that would point to comets and asteroids that participated in the migration. & Nbsp;

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Fuente: mi+d


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