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By Ashley Strickland, CNN (CNN) — Astronomers have long searched for clues that a hidden companion star sits out of view near the red supergiant star Betelgeuse. Now, they’ve uncovered a new piece of evidence: a trail like the wake behind a boat, cutting through Betelgeuse’s upper atmosphere, likely forged by the unseen companion. Betelgeuse’s reddish tint can be spotted gleaming from the Orion constellation, situated about 650 light-years away from Earth. The bright star is so large that more than 400 million suns could fit inside of it. Its relative proximity and luminosity have made it a favorite among astronomers who observe and study the giant star’s evolution. Yet, despite being so well known, Betelgeuse has its share of secrets — one of the biggest being why it appears to vary in brightness over a six-year cycle, and if the unseen stellar companion, nicknamed “Betelbuddy,” is responsible for this variability. Hints about the possible companion star were shared in research published last year, in which scientists suggested formally naming the object Siwarha, or “her bracelet,” an Arabic name befitting the companion to Betelgeuse, which means “Hand of the Giant.” (“Elgeuse” is also the historic Arabic name of the Orion constellation.) Siwarha would likely be too small and faint to be seen given its proximity to Betelgeuse, which has expanded as it has burned through all the hydrogen at its core, bringing it near the end of its life. Now, observations taken over the last eight years have revealed the effects of Siwarha on Betelgeuse: a never-before-seen dense trail of gas spotted moving through the larger star’s outer atmosphere, where Siwarha closely orbits. Siwarha’s trail appeared just after the star crossed in front of Betelgeuse from Earth’s perspective. Astronomers believe Siwarha completes one orbit around Betelgeuse every six years — hence the larger star’s change in brightness every six years. The observations are included in a new study that has been accepted for publication in the Astrophysical Journal. “It’s a bit like a boat moving through water. The companion star creates a ripple effect in Betelgeuse’s atmosphere that we can actually see in the data,” said lead study author Andrea Dupree, an astronomer at the Harvard-Smithsonian Center for Astrophysics, in a statement. “For the first time, we’re seeing direct signs of this wake, or trail of gas, confirming that Betelgeuse really does have a hidden companion shaping its appearance and behavior.” Spotting the wake Betelgeuse is about 15 times the mass of our sun and 1,400 times bigger in diameter, Dupree said. Meanwhile, Siwarha is tiny and might be smaller than our sun. “If you placed Betelgeuse at the center of our solar system, the surface would extend to Jupiter and the hot atmosphere above it would extend at least 6 times further out,” Dupree said. “So the companion is really plowing through a dense atmosphere of the supergiant star.” Dupree’s team has been tracking changes in Betelgeuse’s light for years, using the Hubble Space Telescope as well as ground-based observatories like the Fred Lawrence Whipple Observatory and Roque de Los Muchachos Observatory. Patterns emerged in the observations, captured both close to the star and further away from it, that suggested a companion star was whirling through Betelgeuse’s extended atmosphere. The team recorded shifts in the speed and direction of gases in the large star’s outer atmosphere due to a disturbance. Hubble enabled the team to see how Betelgeuse’s deep atmosphere, or chromosphere, reacted to Siwarha’s motion, while the ground-based observations revealed changes in the extended atmosphere. “What we learn from these latest results is that Siwarha seems to ‘stir up’ Betelgeuse’s extended atmosphere as it orbits, leaving a wake that impacts what we see from Betelgeuse itself,” said study coauthor Morgan MacLeod, a postdoctoral fellow in theoretical astrophysics and member of the Institute for Theory and…

En pleine campagne électorale, la décision était attendue. Et elle donne tort à Jean-Michel Aulas et sa famille, qui avaient attaqué en novembre 2023 le média indépendant Rue89Lyon pour diffamation après la publication le 16 octobre 2023 de ce que les plaignants qualifiaient alors d'"informations calomnieuses" sur un investissement fait par le groupe familial aux […] L’article Le camp Aulas débouté par la justice dans sa plainte pour diffamation contre Rue89Lyon est apparu en premier sur Lyon Capitale.

By Sandee LaMotte, CNN (CNN) — Heart disease is the No. 1 killer of American women and men — and has been for over 100 years. In fact, cardiovascular diseases are the top cause of adult deaths everywhere, responsible for 1 in 3 deaths worldwide. Cardiologists say physical inactivity, smoking, high blood pressure, high cholesterol and diabetes are all to blame — as is an unhealthy diet full of refined grains, added sugars and the artery-clogging saturated fats found in red and processed meats and full-fat dairy. The recently released 2025-2030 Dietary Guidelines for Americans restrict refined grains, added sugars and ultraprocessed foods (known as UPFs) — a move applauded by medical organizations. However, the revised food pyramid — which flips prior pyramids on their heads — also puts red meat and other foods full of protein and saturated fat in a starring role in the top tier, alongside fresh vegetables and fruits known to protect health. Leading cardiologists tell CNN this is upside-down thinking. “Promoting saturated fat and increasing the amount of protein goes against all nutrition and cardiology science,” said Dr. Kim Williams, chair of the department of medicine at the University of Louisville in Kentucky. “We’ve been researching this for decades, and we definitively know saturated fat — such as butter fat, beef tallow, red and processed meat — are all closely associated with more deaths from cardiovascular disease,” said Williams, a past president of the American College of Cardiology. “This does not fall in line with President Trump’s executive order 14303, which mandates that all federal policies use the best scientific evidence available.” That executive order, signed by Trump on May 23, 2025, called for a return to “a gold standard for science” to ensure “that Federal decisions are informed by the most credible, reliable, and impartial scientific evidence available.” Yet it’s exactly the impartial, verified and credible science that the new guidelines ignore, according to cardiologists. In fact, randomized controlled clinical trials — the current gold standard of research — have found replacing saturated fats with vegetable and seed oils reduced cardiovascular disease by some 30%, similar to the benefits of statin medications. “There’s no question that when we remove saturated fat from the diet and add in polyunsaturated and monounsaturated fats from fish, seed and plant sources, we save lives by improving cardiovascular health,” said Dr. Monica Aggarwal, an adjunct clinical associate professor of cardiovascular medicine at the University of Florida in Gainesville. “People are going to look at the new pyramid and think ‘Oh, I can eat as much steak as I like.’ Social media is already full of headlines like: ‘Beef is back on top,’ or ‘Butter is back,’ or ‘Beef tallow is the way to go,” Aggarwal said. “Yet there is no debate that the saturated fat in those foods is linked to heart disease.” Discarding decades of science In a January 8 press conference on the new guidelines, federal officials spoke of their disdain for past nutritional guidance. “For decades, we’ve been fed a corrupt food pyramid that has had a myopic focus on demonizing natural, healthy saturated fats, telling you not to eat eggs and steak and ignoring a giant blind spot — refined carbohydrates, added sugars and ultraprocessed food,” US Food and Drug Administration Commissioner Dr. Marty Makary said at the briefing. The new dietary guidelines call for less than 10% of total daily calories to come from saturated fats, not terribly far from AHA recommendations to keep unhealthy fats to less than 6%. However, 10% or less is an impossible goal, experts say, if the major emphasis of the Make America Healthy Again movement is on eating more proteins with saturated fats. The Nutrition Source, an online resource from the Harvard T.H. Chan School of Public Health, recently put the new dietary guidelines, which recommend three servings of dairy a day, to the…

Trump a raison si Macron ne veut pas suivre la destruction de la merd'ONU qui entrainera celle de la merd'UE, qu'il dégage. Ces merdes nous pourriSSent la vie depuis leur création. (Pour l'ONU De gaulle n'en voulait pas et pour la merd'UE c'est Sarko qui l'a imposé et personne n'a rien dit).