Discovery of Older Material from the Solar System Miscellaneous World DW


Researchers from the United States said they have discovered the oldest verified material on Earth so far. The researchers explained that the age of what is known as the pre-solar granules, which belong to the “Murchison” meteorite, is estimated at five to seven billion years, which makes them older than Earth and older than the entire solar system.

Under the supervision of Philip Heck of the American Feld Museum in Chicago, the researchers said that the sun arose about 4.6 billion years ago, while the Earth arose about 4.5 billion years ago. The researchers confirmed that this discovery indicates that there were about seven billion years ago, a stage of the massive production of stars, in the part we live in from the Milky Way, according to the study published in the current issue of the “Proceeding” magazine published by the American Academy Of science.

The researchers said in a statement to them that “these materials are the oldest solid materials found so far,” noting that these materials “remind us of how stars arose in our galaxy.” This finding was the result of a team analyzing parts of the “Murchison” meteorite that fell in 1969 in Australia.

The researchers had hoped to find a substance earlier than the sunAny preserved granules belonging to the material from which the original material of the solar system originated, which resulted from another star that had escaped a long time ago, and according to researchers, there are such particles in one of every 20 meteorites, but the diameter of one of these particles does not exceed a few Parts of a thousandth of a millimeter.

The researchers have already found in this meteorite their desired goal, for which they grinded a small piece of the meteorite and turned it into a fine powder, then they dissolved the powder in acid, until tiny granules dating back to before the origin of the solar system were left from the silicon carbide granules. “It looked like we were burning a pile of straw in order to find a needle in it,” Heck said, noting that the silicon carbide compound is only a small portion of the interstellar material that researchers use as an indicator, due to its extreme viability.

To determine the age of the fine grains, the researchers used a new method by which they determined the ratio of a certain type of inert neon gas, where the neon isotope 21 is created by this material through a mutual interaction with what is known as cosmic radiation, which means astronomers mean a constant barrage of subatomic particles, That roams the universe regularly from all directions.

The researchers were able to determine the age of the fine grains based on monitoring the frequency of neon 21 in 40 granules: “This is like putting a bucket in a shower of water,” he added, adding: “If we consider that the rain falls continuously, then the amount of water in the bucket shows us The period when the bucket remained exposed to this rain. “

It was found to the researchers through this that some of the grains were exposed to about three billion years of cosmic light, before they entered within the meteorite when our solar system was born, and they are kept inside the meteorite. The researchers also surprisingly found many relatively young grains, which originated less than 300 million years before the birth of the Solar System.

According to the researchers, this confirms the theory that the Milky Way galaxy did not produce stars at a steady pace, Where there was a period before the beginning of our solar system, more stars than usual emerged.

The researchers report that these granules did not arise except at the demise of certain stars, and the researchers are likely that their mass was almost twice the mass of our sun, and their life span was approximately two billion years. “Some people see the rate of the origin of galaxies as constant,” says Philip Hick, “but now, thanks to these grains, we now have direct evidence through meteor samples that there was a period of accelerating star formation in our galaxy, about seven billion years ago.” “.

R / y (dpa)


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