January 30, 2023

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18 The study of iron meteorites reveals the deep history of the solar system

18 The study of iron meteorites reveals the deep history of the solar system

The remaining dust cloud from the solar nebula slowed down the objects orbiting the sun, as the wind resistance slowed the car.

An international research team led by scientists from the Federal Institute of Technology (ETH Zürich) in Zurich has studied iron samples from the nuclei of a group of meteorites that have fallen to Earth at various times, revealing part of the early history of the solar system. Formation of planets.

The first sun

About 4.5 billion years ago, when the Sun was still a young star, before the Earth and other planets formed, the Sun was surrounded by dust and rock fragments known as the “Circumstellar Disk”.

Later, as they merged, these small pieces of rock became the building blocks for many adjacent planets.

But some of them were in the shape of small asteroids, i.e. found in an area of ​​the asteroid belt between Mars and Jupiter, and when parts of those asteroids fall to Earth as meteors, they still have a deep history of the solar system. .

A rotating star disk orbiting a star similar to what happened to the Sun 4.5 billion years ago (European Southern Observatory)

And step Study Published by the team in the journal Nature Astronomy, the team took samples from the nuclei of 18 different iron meteorites, analyzed them with a “mass spectrometer” and obtained a “mass spectrometer” of the elements palladium, silver and platinum.

Isotopes are atoms of the same chemical element that have the same atomic number (i.e., the same number of protons in the nucleus), but differ in atomic mass due to the different number of neutrons in the nucleus of each.

Very old history

Studies show that only a few million years after the formation of the solar system did the metal nuclei of the asteroids heat up and then as they cooled, one of the silver isotopes accumulated inside the asteroid. Radiation decay.

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As the observed cooling process accelerated, the researchers observed intense collisions between smaller asteroids during that period, which led to the asteroid’s insulating rock mantle being severed and exposing its metal core to the cold of space.

Pleiades galaxy surrounded by nebula remains (NASA)

According to the study, between 7.8 and 11.7 million years after the formation of the solar system, the team was able to determine the timing of these collisions with greater accuracy than ever before. At that moment the cloud around the sun was hitting everything.

Confusion before construction

As stated in Press release According to the company, the researchers said that most of the confusion was caused by the decay of the Sun’s nebula, a remnant of the Sun’s gas cloud.

And the word “nebula” literally means something that has no clear shape, and nebulae are actually like that, a group of gaseous and dusty clouds scattered across the galaxy, and if the nebula is high in hydrogen gas they allow new stars to be born in large nurseries containing hundreds of stars. After becoming stars, everyone leaves the team that was born with him.

For example, we can observe something similar today by looking at the Pleiades star cluster of several hundred stars about 150 light-years away from us. When we look at Pleiades in telescopes, we see some star clouds. These stars fed.

Within millions of years, this cloud will be removed from the same stars by strong stellar winds. So when we look at Pleiades, we also look at the past of the sun 4 and a half billion years ago.

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If nebulae are high in hydrogen gas, they allow the birth of new stars (European Southern Observatory)

According to a new study, a dusty cloud remaining from the solar nebula slows down objects around the sun, similar to wind resistance slowing a car’s motion.

But due to intense solar wind and radiation, the cloud disintegrated over time, as is now the case with Plato, which allowed meteorites to accelerate and collide with each other for millions of years, and the insane chaotic collision between asteroids in that contemporary form later led to the appearance of planets.