We already have the world’s first fast neutron nuclear reactor. We are going to use it for AI data centers

The growth of artificial intelligence is driving global electricity demand to historical figures. The expansion of data centers, the advance of electrification and the industrial rebound are straining aging networks that are already suffering from saturation in multiple countries. In this scenario, the digital sector—a large consumer of electricity for the development of AI—faces a paradox: it needs much more energy, but it must do so without increasing its emissions. And there arises a proposal that until recently would have seemed like science fiction: data centers powered by a compact fast neutron nuclear reactor. The Stellaria–Equinix deal that no one saw coming. The French startup Stellaria, born from commissariat to the atomistic energy (CEA) and Schneider Electric, announced a pre-purchase agreement with Equinix, one of the largest global data center operators. According to the press releasethe agreement secures Equinix the first 500 MW of capacity of the Stellarium, the molten salt and fast neutron reactor that the company plans to deploy starting in 2035. This reserve is part of Equinix’s initiatives to diversify towards “alternative energies” applied to AI-ready data centers. Autonomy, zero carbon and waste management. It is a brief summary of the first reactor breed and burn intended to supply data centers. As explained by Stellariaoffers: Completely carbon-free and controllable energy, enough to make a data center autonomous. Underground design without exclusion zone, thanks to its operation at atmospheric pressure and its liquid core. Ultra-fast response to load variations, essential for generative AI. Virtually infinite regeneration of fuel, part of which can come from current waste from nuclear power plants. Multi-fuel capability, from uranium 235 and 238 to plutonium 239, MOX, minor actinides and thorium. For Equinix, this means solving one of its great challenges: operating with guaranteed clean energy 24/7 without depending on the grid. For Europe, it marks the entry into a new generation of ultra-compact reactors: the Stellarium occupies just four cubic meters. The technology behind the reactor. The Stellarium is a fourth-generation liquid chloride salt reactor, cooled by natural convection and equipped with four physical containment barriers. It operates on a closed fuel cycle, capable of maintaining fission for more than 20 years without recharging. Stellaria’s roadmap establishes that in 2029 there will be the first fission reaction and six years later a commercial deployment and delivery of the reactor to Equinix. According to the company, The energy density of this type of reactor is “70 million times higher than that of lithium-ion batteries”, which would allow a single Stellarium to supply a city of 400,000 inhabitants. As fusion progresses, fast fission arrives first. To understand why a fast neutron reactor comes to the world of AI before fusion, just compare the technological moment of each. The merger is making spectacular progress—such as the record of the French WEST reactorwhich maintained a stable plasma for 22 minutes, or the Wendelstein 7-Xwhich sustained a high-performance plasma for 43 seconds—but remains experimental. ITER will not be operational this decade and commercial prototypes will not arrive until well into the 2030s. Advanced fission, on the other hand, is much closer to the market. Reactors like Stellaria’s, with molten salt and fast neutrons, do not require the extreme conditions of fusion and can be deployed sooner. The company plans its first reaction in 2029 and a commercial deployment in 2035. The data centers of the future will no longer depend on the network. Equinix already operates more than 270 data centers in 77 metropolitan areas. In Europe they are powered by 100% renewables, but their future demand for AI will require a constant, carbon-free source that does not congest the electrical grid. According to Stellariathis agreement “lays the foundation for data centers with lifetime energy autonomy.” And, if the company meets its schedule, Europe will become the first region in the world where artificial intelligence is powered by compact reactors that recycle their own nuclear waste. The technological race between advanced fission and fusion is far from over, but, today, the first fast neutron reactor intended for AI does not come from ITER or an industrial giant: it comes from a French startup. Europe has just opened a door that could transform, at the same time, the future of energy and computing. Image | freepik and Stellaria Xataka | Google hit the red button when ChatGPT came upon it. Now it is OpenAI who has pressed it, according to WSJ

A neutron core of the size of a bus

In the Ukraine War, nuclear It is not a purely arms issue. Among the most devastating scenarios that beat about the contest is the possibility of an error that leads to an unprecedented environmental disaster. We already knew that the Chernobil plant He had a hole And continue Without being able to repairbut the reach is much broader than the sadly famous plant. Under constant threat. The truth is that the Russian invasion of Ukraine has not only transformed the military map of Europe, but has put at risk an extensive network of nuclear facilities that were never designed to resist bombings. Although international attention has focused on Zaporiyia Centralthe largest in Europe and in Russian hands since 2022the country houses multiple reactors, research laboratories and spent fuel deposits that make up a delicate risk mosaic. Among them stands out Institute of Physics and Technology from Járkov, where is the known device as Neutron Sourcewhich contains several tens of kilos of enriched uranium capable of polluting vast areas if they were dispersed. Located just 14 kilometers from the front, the building has suffered More than 70 impacts Russian ammunition confirmed, which fears that Moscow’s goal is not accidental, but deliberate. Járkov, military white. The Institute, which in Soviet times contributed to the design of The first atomic bomb From Moscow, he agreed in 2010 withdrawing his uranium suitable for armament and sending it to Russia under pressure from the United States, in a non -proliferation effort. However, still custody materials of enormous danger, such as high radiation uranium contained in Neutron Source, built with US financing in exchange for that resignation. The installation combines a core of the size of a school bus with a particle accelerator about 30 meters, surrounded by metal shields, but the building that houses it It lacks protection in front of attacks. The bombings have left cracks, have dropped plaster of the walls and reached destroy a transformer In 2022, plunging the complex in blackout months and forcing scientists to improvise heating systems to avoid irreversible damage to fuel bars. Ukraine accuses Russia of echocideclaiming that a direct impact could release radiation on an area inhabited by 640,000 people. The nuclear installation of Neutron Source in Járkov on April 4 Chernobil’s spectrum. We have gone counting. Since the beginning of the invasion, the nuclear catastrophe scenarios have been present. In February 2025, A Russian drone pierced The steel structure covered by the reactor 4 of Chernobil, the most contaminated area of ​​the planet, breaking its hermetic seal, although without immediate leaks. In Zaporiyia, repeated attacks have put the cooling of the six reactorsespecially after destruction in 2023 on a dam that forced to depend on an emergency pond and two electric lines vulnerable to artillery. Each incident envives the fear of a radiological accident that, even without being of the Magnitude of 1986could disperse contaminating materials by large areas of Eastern Europe. The mere synchronization of certain attacks, such as Chernobil’s On the eve of the Munich Security Conference, it is played by kyiv and its allies as strategic messages of the Kremlin, which uses nuclear risk as a weapon of political intimidation. Collateral effects Plus: Not only Ukrainian facilities are in danger. At the end of August, remains of an intercepted Ukrainian drone They damaged a station Transformer in the immediate vicinity of the Kursk Central, in Russian territory, forcing to reduce its production. The episode illustrated how war turns civil nuclear infrastructures into collateral damage to a military confrontation in which drones, missiles and artillery operate increasingly closest to high -risk objectives. The experts Remember That no central or research laboratory in Ukraine was built to withstand direct impacts of modern ammunition, so the prolongation of the conflict multiplies the probabilities of an accident. Between resilience and constant threat. Had the New York Times In a wide report that, despite the daily danger, the Ukrainian scientists of the Járkov Institute They continue with projects of nuclear fusion and experiments with radioactive hydrogen, collecting data that they expect to present in international conferences. The paradox of continuing to investigate under bombing reflects both the resilience of the personnel and the fragility of a country that, in addition to resisting militarily, must guard materials whose release would have devastating consequences. In the words of one of the center engineers to the TimesRussian attacks seem to lack logic, but their repetition suggests a pressure strategy through radiological risk. Until now the catastrophe has been avoided fortune and technical contingenciesbut every day of war prolongs a pulse in which radiation could become involuntary or deliberate weapon, with effects that would overflow the borders of Ukraine. Image | Ministry of Defense of UkraineEnergoatom.com.ua In Xataka | The US has spent so much time developing its F-35 that has lost the career of the future: that of combat drones In Xataka | Ukraine has found the antidote to the Russian Kamikaze drones in World War

Here the ‘calm’ neutron observatory was installed

In a corner of the Guadalajara Science and Technology Park, far from large telescopes and space agencies, there are A 40 -ton mole dedicated to detecting high -energy particles that constantly bombard the earth. It’s called calm. “Castilla-La Mancha Neutron Monitor”. And for more than a decade it is the first and only installation of its kind in Spain. His work: monitor the attacks of the sun and understand how cosmic rays affect our planet. From space to Guadalajara. The origin of calm is intrinsically linked to the mission Solar orbiter of the European Space Agency. Scientists from the University of Alcalá designed one of the key instruments of the probe, the energy particle detector. Following that experience, an idea arose: build an instrument on land. “We thought of a system that would allow us He explained to Eldiario.es Juan José Blanco, head of the project. Running since 2011. What began almost as a support project for a space mission of ESA has become an international reference in neutron monitoring. Financed with funds from the European Union and the Board of Communities of Castilla-La Mancha, Calm is integrated into the World Network of Neutron Monitorswhere you pour your data in real time. Today is a distributed project. Calm has a twin node called orca which detects both neutrons and muons. It is at the Antarctic base Juan Carlos I of Livingston Island, a magnetically privileged location. The project also has a mobile detector called Mini-Calma which has traveled aboard the Hesperides ship to measure the flow of cosmic rays throughout the journey to Antarctica. The last node to join the project is called Icaro and is installed in the Izaña Atmospheric Observatory (in Tenerife). It measures neutron of solar origin from 2,000 meters of altitude. What exactly measures. When Cosmic rays (High energy particles from deep space) collide with the atoms of our atmosphere, generate a cascade of secondary particles. Among them, neutrons that reach the surface. The sun, with its magnetic field, acts as a modulating shield: the greater solar activity, less galactic cosmic rays reach the earth, and vice versa. Measuring neutron flow, calm can infer solar activity. In addition, it is able to directly detect the arrival of solar energy particles that have been expelled during large eruptions. How a neutron monitor works. The detector consists of gas full of gas surrounded by several layers that alternate lead and polyethylene. This structure allows to reject neutrons that are not very energetic, that is, the environmental ones, letting those who come from space pass, after reducing their speed, to be able to analyze them. With 12 of its 15 active tubes, this 40 -ton machine is a particle filter of amazing precision. What is the use of calm. All this technology has a very practical purpose: to protect us from spatial meteorology. Solar eruptions and coronal mass ejections can be spectacular and create intense northern norter, but also They are extremely dangerous For our technological civilization. The Operators of the Electricity use this data to protect their facilities. Airlines and space agencies need them to assess radiation levels on high altitude routes. And the space industry to protect astronauts and satellites in orbit. It even has applications for interplanetary trips. After having already measured a complete solar cycle of 11 years, calm can be used in the missions to Mars to know which is the best time to start the trip, minimizing Astronaut’s exhibition to radiation. Image | Uah In Xataka | The biggest study in mice sows doubts about travel to Mars: the space shrinks the kidneys

The Chandra X-ray Observatory shows us how a neutron star has “fractured a bone” to our galaxy

As if it were the radiography of a broken bone, the last image that has come to us from NASA shows us the image of a whitish structure whose natural silhouette has been “fractured” by the passage of a mysterious object. An object in whose nature we have been able to investigate thanks precisely to the recent observations. The fracture. The new image It was captured Combining captures of different astronomical observatories and shows us the fracture in G359.13142-0.20005 (abbreviated as G359.13) as well as the object that would have caused this fracture: a neutron star or pulsar. The “bone.” G359.13, the “bone” of this photo, is a cosmic structure called sometimes also as “snake.” This cosmic filament expands over about 230 light years and is about 26,000 light years from the earth, near the core of our galaxy. Filaments that emit radio waves that make them detectable from our planet. These structures are directed, NASA explainsby magnetic fields that run in parallel to them. The radio waves that come to us are caused by particles loaded with energy that form spirals along these magnetic fields. Joint work. The image has been possible Thanks to the combination of observations taken in different segments of the electromagnetic spectrum. As we pointed out, the “bone” of the photo is a visible structure in radio lengths, and its observation has been possible thanks to the Radiolescopes of the Merkat Observatory. When “diagnosing” the cause of this fracture, however, resort to X -rays. Those of Chandra Space Observatoryto be more exact. The reason is that the main suspect of causing this fracture is hidden in the structure itself. Fortunately, this mysterious object also emits in the frequency of X -rays, since what is hidden after this “fracture” seems to be a neutron star or, probably, a pulsar. According to NASA, this object would be emitting light both in the form of radio waves and X -ray, to which an additional x -ray source caused by electrons and positrons (its antiparticles) accelerated to large energies should be added. To millions of km/h. The fracture itself would have been caused by the irruption of the pulsar at exorbitant speeds. According to astronomer estimation, this speed would be between 1.6 million and 3.2 million kilometers per hour. A study linked to this image was published last year In an article In the magazine Monthly Notices of the Royal Astronomical Society, Change perspective. The image is a memory that sometimes things are not what they seem. The light that our eyes perceive is a tiny fraction of the emissions that exist in the cosmos. Sometimes the invisible to our eyes can be made visible using the correct instruments, while other times the opaque may not be so much if we change perspective. In Xataka | One of the objectives of the Webb Space Telescope was to look for signs of life on other planets. He just found them Image | NASA/CXC/Northwestern Univ./f. Yusef-Zadeh et al; RF/Sarao/Meerkat; NASA/CXC/SAO/N. Wolk

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