The oldest magnetic record ever discovered in a meteorite. Free Technical Library News

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The oldest magnetic record found in a meteorite

17.04.2018

A team of researchers from the UK, Germany and Norway have found that an iron-bearing material called olivine, which makes up most meteorites, contains "records" of magnetic fields that existed during the formation of the solar system, about 4.6 billion years ago. This is a surprising fact, because olivine has non-uniform magnetic properties, and it is not very well suited for storing information in a magnetic form. Nevertheless, the study of this phenomenon can lead to an understanding of the role of magnetic fields in the formation of objects in the solar system from a protoplanetary disk.

"The results of our research show that traces of magnetic fields that existed at the time of the "birth" of the solar system are contained in the material of the meteorites in our collections" - says Jay Shah (Jay Shah), lead researcher - "With a picture of the remanence, we can get information about the ancient magnetic fields that played a role in the formation of the solar system from the protoplanetary disk."

There is a field in modern science called paleomagnetism, which focuses on ancient rocks and other materials that went through a rapid cooling cycle during their formation. In the depths of these materials, images of magnetization have been preserved, which are a reflection of the magnetic fields that existed at the time of their formation. By deciphering this information, researchers get an idea about magnetic fields and about some of the processes in which these magnetic fields took part.

The basis of paleomagnetism is the so-called Nell domain theory, according to which uniformly magnetized grains of material can retain their properties on a geological time scale. However, Nell's theorem says nothing about inhomogeneously magnetized material grains, and it is this form of magnetization that is the most informative. Some of the scientists investigated this issue and found that the state of magnetization persists for a long time and with its inhomogeneous character, however, the exact answer to this question has not been found to date.

Recent results indicate that iron-bearing materials can retain inhomogeneous magnetization for more than 4 billion years. During the research, scientists heated olivine above 300 degrees Celsius, to the highest possible temperature at which the grains of magnetic material still retain their original properties. And to obtain the data, the researchers used several state-of-the-art methods for measuring and mapping the distribution of magnetic fields in olivine grains, which are several hundred nanometers in diameter.

“I hope that our research will allow us to better understand the nature and meaning of the information hidden in the complex patterns of ancient remanence,” says Jay Shah, “This, in turn, will allow us to investigate the magnetic fields that existed in the solar system at that time when the earth was just beginning to form.

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The pants of the emperor are being studied 01.05.2006

Swiss surgeon Alessandro Lugli, who works at the University Hospital of Basel, is interested in the history of Napoleon.

As you know, the self-proclaimed Emperor of France died in exile on the island of Saint Helena at the age of 52. The autopsy performed by his personal physician was done at a level quite worthy of modern doctors.

The cause of death was stomach cancer. Nevertheless, for almost two centuries, various other assumptions have been put forward about Napoleon's fatal illness. Lugli decided to confirm the conclusion of the emperor's personal doctor. Gastric cancer is characterized by rapid weight loss shortly before death. Data on Napoleon's weight does not exist, but Lugli measured the waistband of 12 pairs of Napoleon's trousers, including the last one. Knowing the height of a person, by the volume of the waist, you can calculate the weight.

The results of the study showed that while in exile, Napoleon put on weight, but in the last six months he began to lose a lot of weight. The waist has shrunk nearly five inches, which equates to a 20-30 pound weight loss.

"We can't say that these data are enough to make a diagnosis of stomach cancer," Lully says, "but they strongly support the autopsy results." Of course, it would be interesting to follow the changes in the waist of Napoleon during the Russian campaign, but, apparently, these studies are still ahead.

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