In 1778 Mozart attempted to teach composition to a French noblewoman. It didn’t go well at all, but thanks to her we now have unpublished works

Wolfgang A. Mozart died more than two centuries ago at the age of 35, but neither the time that has passed since his death nor his youth have prevented his talent from continuing to surprise us in 2026. Literally. Although few musicians have been as scrutinized as the Austrian genius, the Bibliothèque Nationale de France (BnF) just discovered an unpublished notebook from 1778 with scores from Mozart’s hand. The 44-page work contains seven pieces for flute and harp. Beyond the artistic value, the discovery sheds new clues about his life. The date: 02/02/2026. Sometimes chance is capricious. Coincidentally, that day, a week after the 270th anniversary of Mozart’s birth, one of the BnF conservators was rummaging through old manuscripts in the archive when he came across a piece that caught his attention. “I opened it and saw staves full of deletions, corrections and additions,” relates the BcN employee, François-Pierre Goy, responsible for the collections prior to 1800. “I recognized Mozart’s handwriting, his way of drawing the brackets, the rounded treble clefs leaning forward, the double final bars with fermatas above and below,” explained Goy to Le Monde. If it is not common to find an unpublished work by Mozart, that specific discovery was even more exceptional: the notebook dates from the end of the 18th century, but it is not signed and the BnF stored it among twenty manuscripts that were in the process of being recataloged. Following the trail. Goy had a hunch (one based on his extensive knowledge of the Austrian composer), but that is not enough to attribute an anonymous notebook to Mozart. To confirm his suspicions he went to Laurence Decoberthead of the Iconography and Documentation Service of the Department of Performing Arts of the BnF and a good connoisseur of the Austrian composer. In fact, he participated in the exhibition ‘Mozart, a French passion’, in 2017. Their analysis must also have pointed to Mozart’s authorship because Goy and his colleague decided to turn to a third specialist. Just a few months ago, in April, there was a knock on the door of Armin Brinzingthe director of the Mozart Library at the Mozarteum University of Salzburg. The expert did not have many doubts either: he confirmed the attribution and, above all, highlighted the historical importance of the work. “It is Mozart’s most important discovery in decades,” claims. What does the notebook contain? The document contains 44 handwritten folios with seven short works for flute and harp, as well as composition exercises, nothing strange if we take into account the context in which the experts place it: the BnF believes that it collects the composition lessons that Mozart gave to Marie-Louise-Philippine de Bonnières de Guînesan aristocrat three years younger than the Austrian and who is remembered above all for her skill as a harpist. “The use of French paper in the manuscript and its content (composition exercises and seven pieces for flute and harp) suggest that it bears witness to the lessons that Mozart gave directly from May to July 1778, during his last stay in Paris, to de Guînes,” explains the French organization. The young harpist, who was 19 years old at the time, was the eldest daughter of Adrien-Louis de Bonnières de SouastreDuke of Guînes and great lover of music. In fact, the duke himself was reputed to be a virtuoso flutist. By hiring Mozart as a composition teacher, he hoped that his daughter would create “great sonatas” for the instruments they both played: she the harp; he the flute. “I’ve tried everything”. The notebook located between the shelves of the BnF completes an episode in Mozart’s life that we already knew in part. Through a letter that Wolfgang wrote in May 1778 to his father, Leopold, who remained in Salzburg, we know, for example, that his young pupil may have been a skilled harpist, but she did not seem to have the makings of a composer. “She has no ideas, nothing comes of it. I’ve tried everything with her,” recognized Mozart frustrated. In general, his stay in Paris was not as profitable as he expected. He did not receive the recognition he desired and Goy explains that the duke never paid the Austrian for a flute, harp and orchestra concert that he commissioned. “We don’t even know if the Guînes family ever performed the pieces.” Why is it important? Locating a lost Mozart manuscript is always good news, even more so if (as in this case) it includes several unknown pieces. The notebook found by Goy, however, presents a series of peculiarities that make it even more interesting on a historical level. For example, the works are intended for a flute that the duke had bought in London, an instrument “rare, if not unique in Paris”, clarify from the BnF. Furthermore, Mozart did not devote the same attention to the flute or harp that he did to other instruments for which he created more repertoire, such as the clarinet. The new BnF work is also completed with annotations that seem 100% taken by the student and six blank final pages, without annotations. The big question. The manuscript is fascinating, but the truth is that experts seem to have few doubts about its origin. The BnF believes that it is one of the pieces “confiscated” in the mansion of the Duke of Guînes in mid-1794, during the Terror period of the French Revolution. Goy himself remembers that in the National Archives of France there is an inventory that cites “two bundles of sheet music” bound books taken from the aristocrat’s house in May 1794, after he sought refuge in England. The truth is that in recent years music lovers have enjoyed the discovery of various works unknown by Mozart, including pieces from his adolescence. “One of the most important”. Whoever wants to enjoy the short pieces for flute and harp that have just been resurfaced from the BnF archives can do so now in a performance made June 21 in the Ovale room of … Read more

The James Webb has just done something we have never achieved with an interstellar visitor: read its chemical composition

Every time an interstellar visitor approaches the vicinity of Earth, a great stir is generated in all kinds of more or less specialized sectors. There are those who see it as a golden opportunity to learn a little more about our neighboring planetary systems and also those who fear them, considering them as a possible extraterrestrial technology. We saw it in 2017 with Oumuamua, in 2019 with 2I/Borisov and last year with comet 3I/ATLAS. We don’t talk so much about the first and the second, but about the third studies continue to be published. For example, one that has recently been made known, in which, thanks to James Webb, has been achieved for the first time analyze the chemical fingerprint of an interstellar object. Very rare gases for our solar system. Thanks to the MIRI spectrograph, the James Webb’s specialized mid-infrared instrument, it has been possible to analyze the chemical composition of 3I/ATLAS. This is because different chemicals reflect light differently. By analyzing the resulting spectrum, different gases can be identified. In this case, water vapor was detected beyond the nucleus, possibly due to the melting of ice grains present in the comet. In addition, both methane and carbon dioxide were identified very close to the core. It is the first time that methane has been identified in an interstellar visitor. The proportion of these last two gases in relation to water is very high. Too much for what is normal for comets in the solar system, which is why the idea that this visitor came from some other very remote place continues to be supported. MIRI shows the interstellar comet in three different wavelengths of light and illustrates where the different gases were located at the time the comet was observed. Two key dates. The measurements with the James Webb Space Telescope were carried out on two different dates. On the one hand, between December 15 and 16, 2025 and secondly on December 27 of that same year. At that time, our star visitor began his return journey after going around the Sun. The Sun is essential. Attempts had been made to identify the gases of this comet before. However, the methane remained hidden until this point. The authors of the study believe that this is because it had remained hidden in its depths, under the ice, and that it took the Sun to melt part of that ice for it to emerge to the surface. The search continues. When 3I/ATLAS approached our planet, many instruments took the opportunity to land on it and try to obtain as much data as possible. A good example of this is the JUICE probe, of the European Space Agency. While the initial goal of this mission is to study Jupiter’s icy moons, it was in the right place at the right time when we welcomed our mysterious visitor. The ESA calculation which would be their closest ship at the time of the approach, so they used it to take information about the comet in November 2025. This was sent to Earth in February 2026, so since then there have been scientists working on its analysis. The study that has now been published is possibly just the first of many. And 3I/ATLAS has already left, but the interest in knowing everything possible about it stayed with us. Image | International Gemini Observatory/NOIRLab/NSF/AURA/B. Bolin | NASA, ESA, CSA, STScI, M. Belyakov (Caltech), I. Wong (STScI), Image Processing: A. Pagan (STScI) In Xataka | Avi Loeb believed he had found aliens. Does anyone have a simpler explanation: pollution?

The chemical composition of galaxies has always been full of unknowns. James Webb has taken a huge step to solve it

The James Webb Space Telescope sees where others can’t: its infrared vision pierces clouds of cosmic dust and reaches galaxies so far away that it took billions of years for its light to reach us. Looking far into space is, in that sense, looking back in time. However, what James Webb has seen in these galaxies differs from what was expected: these early galaxies seem to have too much nitrogen, much more than expected. Among the exotic possible explanations of science, hypotheses such as gigantic stars never seen before, black holes functioning as catalysts for galactic chemistry or large quantities of stars have passed. In fact, that was the topic of conversation in the middle of a phone call while Mexican astrophysicist José Eduardo Méndez-Delgado waited in line for the doctor. On the other end of the line, his colleague Karla Arellano-Córdova, who was in Edinburgh. In that informal talk they decided to change the prism: perhaps the problem was not the galaxies, but how we measure them. The discovery. The proposal from this international team is to analyze three light signals from the same oxygen ion to calculate temperature and density at the same time, without starting from one to calculate the other (the original source of error). The result: the gas was a hundred or a thousand times denser than was assumed in those galaxies. With that correction, the galaxies turned out to be richer in metals than they appeared and the excess nitrogen was drastically reduced. Why it is important. First, because the metallicity of a galaxy is directly related to its history: the more metals there are in its composition, the more stars have been born and died within it. Until now we were underestimating this figure, which made those early galaxies appear very different from our own and suggested a sharp and discontinuous evolution. Now they look more like what we know. But the elements essential for life, such as carbon, oxygen or nitrogen, did not exist when the universe was born: they were manufactured by the stars inside and expanded when they died. Hence the interest in knowing the chemistry of galaxies: it helps to understand when the universe had the necessary ingredients for life. With the wrong measurements, we don’t know if those ingredients were there earlier and in more places than we thought. Context. The standard method to know the composition of a distant galaxy is to analyze the spectral lines of its light based on the density of the gas and its temperature. The problem is that in these primitive galaxies the gas is much denser than expected, so its application as a thermometer works poorly. And from here on, everything failed. The nitrogen anomalies appeared in the first scientific data from the James Webb Space Telescope, as this either this. Since the results did not fit the models, the scientific community threw itself into trying to find explanations. This paper proposes to take a step back: before interpreting stellar physics, check that the measurements are correct. Besides, the Webb now allows it: simultaneously detects oxygen lines in the ultraviolet and in the optical in such distant galaxies. How they do it. In essence, the trick is choosing the right signals. One of the oxygen light lines, visible in ultraviolet, has a special property: it does not distort even if the gas is very dense, something that happened with the lines they were using previously. By combining it with two other signals from the same atom, the research team can calculate temperature and density at the same time, as if they were solving two simultaneous and independent equations. Using statistical simulations, the team found that the results were consistent with other independent measurements of the same galaxies. Yes, but. As the team explains in the work, their method corrects the density error, but not other possible errors that are equally important: the gas of these galaxies also has internal temperature variations, and that can bias the results in ways that this study does not resolve. Furthermore, the method only works well when all three light signals from oxygen are clearly detected. In three of the six galaxies analyzed this was not possible, and the results are less precise. Nitrogen remains a problem. The overabundances come almost entirely from a particular ion whose emission is extraordinarily sensitive to temperature: a variation of just ten percent in that parameter would reduce the calculated nitrogen by half. No one has yet measured that temperature directly. However, it points out a path to follow before looking for “exotic” explanations: verify that the measurement tools are up to par. In Xataka | For a time it was one of the asteroids most watched by astronomers: the Webb has just resolved a key doubt In Xataka | James Webb has been detecting red dots in the universe for years: the only problem is that we don’t know what they are Cover | Oleg Moroz

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