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Dark skies of Paranal Observatory in Chile are under threat

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Sunday, April 6, 2025

The European Southern Observatory’s Paranal Observatory lies under some of the darkest and clearest skies in the world, in Chile’s Atacama Desert. Now a new construction project is threatening to cause irreparable damage to the views of deep space, visible from this pristine site. In this image, Jupiter is the bright object near ESO Photo Ambassador Petr Horálek (standing at center). The telescopes in this view are the 4 Unit Telescopes (UTs) that comprise ESO’s Very Large Telescope VLT. Also in this shot are 4 smaller Auxiliary Telescopes (ATs). Image via ESO/ P. Horálek. Dark skies of Paranal Observatory under threat The night sky over the European Southern Observatory’s Paranal Observatory in Chile is said to be the darkest and clearest over any astronomical observatory in the world. Astronomical data gathered under these pristine skies let astronomers present the first image of an exoplanet, and confirm the accelerated expansion of the universe. But now, according to ESO, a new industrial megaproject is threatening the observatory’s dark skies. A preliminary analysis by ESO suggests the project would cause “devastating and irreversible” harm to the region’s night sky. That megaproject is a massive industrial complex by AES Andes, based in Santiago, Chile. This company is a subsidiary of the U.S. power company AES Corporation. According to ESO, the AES Andes complex would be city sized (more than 7,400 acres) and lie just a few kilometers from Paranal Observatory. The ESO analysis follows an environmental assessment, submited by AES Andes on December 24, 2024. AES Andes’ project is called INNA, for Infraestructura Energética para la Generación de Hidrogeno y Amoníaco Verde. The project seeks to make use of the solar and wind resources in the area. ESO’s director general Xavier Barcons said: The proximity of the AES Andes industrial megaproject to Paranal poses a critical risk to the most pristine night skies on the planet. Dust emissions during construction, increased atmospheric turbulence, and especially light pollution will irreparably impact the capabilities for astronomical observation, which have thus far attracted multi-billion-Euro investments by the governments of the ESO Member States. View larger. | This map of the region shows the location of Paranal Observatory in the Atacama Desert in Chile along with the proposed industrial complex. Image via ESO. The results of the analysis The INNA project would include construction of a port, ammonia and hydrogen production plants and thousands of electricity generation units. The analysis said that light pollution would increase by at least 35% above the VLT and by more than 50% above the south site of the Cherenkov Telescope Array Observatory (CTAO-South). The increase in air turbulence and vibrations would further cause problems. For example, the Extremely Large Telescope, currently under construction, is extremely sensitive to even the smallest vibrations. The nearby INNA project wind turbines would impair its abilities. How would this harm astronomers’ research? One example – described by Paul Scott Anderson of EarthSky – is that, after its completion, the ELT would have the capability to find alien life in just hours. Will that still be true if AES Andes carries out its industrial megaproject? The impact of light pollution on these telescopes even puts our planet at risk. A representative of ESO, Itziar de Gregorio-Monsalvo, said: With a brighter sky, we severely limit our ability to … monitor asteroids that could cause damage to our planet. We build the largest and most powerful telescopes, in the best place on Earth for astronomy, to enable astronomers worldwide to see what no one has ever seen before. Light pollution from projects like INNA doesn’t just hinder research, it steals our shared view of the universe. The director of operations for ESO, Andreas Kaufer, said: The light-pollution figures we are reporting assume that the project will install the most modern available luminaries in a way that minimizes light pollution. However, we are concerned that the inventory of light sources planned by AES is not complete and fit for purpose. In that case, our already alarming results would underestimate the potential impact of the INNA project on the Paranal sky brightness. Request to move the project Barcons said: ESO and its Member States are fully supportive of energy decarbonization. For us Chile should not have to make a choice between hosting the most powerful astronomical observatories and developing green-energy projects. Both are declared strategic priorities by the country and are fully compatible — if the different facilities are located at sufficient distances from one another. ESO also has an executive summary of the report on the environmental impact assessment. ESO said: The relocation of this project remains the only effective way to prevent irreversible damage to Paranal’s unique skies. Chilean authorities will look at the full technical report in late April 2025. Views from Paranal Observatory This image showcases ESO’s Paranal Observatory and the Very Large Telescope (VLT). They sit at an altitude of 8,530 feet (2,600 meters) in the Atacama Desert in Chile. The snow-capped peak in the background is the volcano Llullaillaco, on the Argentinean border. ESO said, “This image is a testimony of the magnificent quality of the air and the ideal conditions for observing at this remote site.” Image via ESO/ G.Hüdepohl. A laser shoots out of one of the Unit Telescopes of the Very Large Telescope (VLT). Image via ESO/ Yuri Beletsky. This scene from Paranal Observatory shows an Auxiliary Telescope in the foreground between the Magellanic Clouds as the Milky Way arches overhead. Image via ESO/ R. Wesson. Bottom line: The Atacama Desert in Chile, where ESO’s Paranal Observatory sits, has some of the clearest and darkest skies in the world. Groundbreaking astronomical discoveries have come from the observatories there. But a new industrial complex threatens the observatory with devastating and irreversible impacts. Via ESOThe post Dark skies of Paranal Observatory in Chile are under threat first appeared on EarthSky.

ESO's Paranal Observatory, in Chile's Atacama Desert, has some of the world's clearest and darkest skies. But a new construction project now threatens them. The post Dark skies of Paranal Observatory in Chile are under threat first appeared on EarthSky.

The Milky Way arching through a dark sky with observatory buildings and a man on a structure reaching upward. — The European Southern Observatory’s Paranal Observatory lies under some of the darkest and clearest skies in the world, in Chile’s Atacama Desert. Now a new construction project is threatening to cause irreparable damage to the views of deep space, visible from this pristine site. In this image, Jupiter is the bright object near ESO Photo Ambassador Petr Horálek (standing at center). The telescopes in this view are the 4 Unit Telescopes (UTs) that comprise ESO’s Very Large Telescope VLT. Also in this shot are 4 smaller Auxiliary Telescopes (ATs). Image via ESO/ P. Horálek.

Dark skies of Paranal Observatory under threat

The night sky over the European Southern Observatory’s Paranal Observatory in Chile is said to be the darkest and clearest over any astronomical observatory in the world. Astronomical data gathered under these pristine skies let astronomers present the first image of an exoplanet, and confirm the accelerated expansion of the universe. But now, according to ESO, a new industrial megaproject is threatening the observatory’s dark skies. A preliminary analysis by ESO suggests the project would cause “devastating and irreversible” harm to the region’s night sky.

That megaproject is a massive industrial complex by AES Andes, based in Santiago, Chile. This company is a subsidiary of the U.S. power company AES Corporation. According to ESO, the AES Andes complex would be city sized (more than 7,400 acres) and lie just a few kilometers from Paranal Observatory. The ESO analysis follows an environmental assessment, submited by AES Andes on December 24, 2024.

AES Andes’ project is called INNA, for Infraestructura Energética para la Generación de Hidrogeno y Amoníaco Verde. The project seeks to make use of the solar and wind resources in the area.

ESO’s director general Xavier Barcons said:

The proximity of the AES Andes industrial megaproject to Paranal poses a critical risk to the most pristine night skies on the planet. Dust emissions during construction, increased atmospheric turbulence, and especially light pollution will irreparably impact the capabilities for astronomical observation, which have thus far attracted multi-billion-Euro investments by the governments of the ESO Member States.

Map of the Paranal Observatory area with locations of telescopes and proposed power planet marked. — View larger. | This map of the region shows the location of Paranal Observatory in the Atacama Desert in Chile along with the proposed industrial complex. Image via ESO.

The results of the analysis

The INNA project would include construction of a port, ammonia and hydrogen production plants and thousands of electricity generation units. The analysis said that light pollution would increase by at least 35% above the VLT and by more than 50% above the south site of the Cherenkov Telescope Array Observatory (CTAO-South). The increase in air turbulence and vibrations would further cause problems. For example, the Extremely Large Telescope, currently under construction, is extremely sensitive to even the smallest vibrations. The nearby INNA project wind turbines would impair its abilities. How would this harm astronomers’ research? One example – described by Paul Scott Anderson of EarthSky – is that, after its completion, the ELT would have the capability to find alien life in just hours. Will that still be true if AES Andes carries out its industrial megaproject?

The impact of light pollution on these telescopes even puts our planet at risk. A representative of ESO, Itziar de Gregorio-Monsalvo, said:

With a brighter sky, we severely limit our ability to … monitor asteroids that could cause damage to our planet. We build the largest and most powerful telescopes, in the best place on Earth for astronomy, to enable astronomers worldwide to see what no one has ever seen before. Light pollution from projects like INNA doesn’t just hinder research, it steals our shared view of the universe.

The director of operations for ESO, Andreas Kaufer, said:

The light-pollution figures we are reporting assume that the project will install the most modern available luminaries in a way that minimizes light pollution. However, we are concerned that the inventory of light sources planned by AES is not complete and fit for purpose. In that case, our already alarming results would underestimate the potential impact of the INNA project on the Paranal sky brightness.

Request to move the project

Barcons said:

ESO and its Member States are fully supportive of energy decarbonization. For us Chile should not have to make a choice between hosting the most powerful astronomical observatories and developing green-energy projects. Both are declared strategic priorities by the country and are fully compatible — if the different facilities are located at sufficient distances from one another.

ESO also has an executive summary of the report on the environmental impact assessment. ESO said:

The relocation of this project remains the only effective way to prevent irreversible damage to Paranal’s unique skies.

Chilean authorities will look at the full technical report in late April 2025.

Views from Paranal Observatory

A reddish desert with buildings atop a mountain and a snow-capped peak in the far distance. — This image showcases ESO’s Paranal Observatory and the Very Large Telescope (VLT). They sit at an altitude of 8,530 feet (2,600 meters) in the Atacama Desert in Chile. The snow-capped peak in the background is the volcano Llullaillaco, on the Argentinean border. ESO said, “This image is a testimony of the magnificent quality of the air and the ideal conditions for observing at this remote site.” Image via ESO/ G.Hüdepohl.

A telescope with a beam of light coming out the top and aiming for the Milky Way. — A laser shoots out of one of the Unit Telescopes of the Very Large Telescope (VLT). Image via ESO/ Yuri Beletsky.

Telescopes under a dark sky with the Milky Way and some other star clouds. — This scene from Paranal Observatory shows an Auxiliary Telescope in the foreground between the Magellanic Clouds as the Milky Way arches overhead. Image via ESO/ R. Wesson.

Bottom line: The Atacama Desert in Chile, where ESO’s Paranal Observatory sits, has some of the clearest and darkest skies in the world. Groundbreaking astronomical discoveries have come from the observatories there. But a new industrial complex threatens the observatory with devastating and irreversible impacts.

Via ESO

The post Dark skies of Paranal Observatory in Chile are under threat first appeared on EarthSky.

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Designing a new way to optimize complex coordinated systems

Using diagrams to represent interactions in multipart systems can provide a faster way to design software improvements.

Coordinating complicated interactive systems, whether it’s the different modes of transportation in a city or the various components that must work together to make an effective and efficient robot, is an increasingly important subject for software designers to tackle. Now, researchers at MIT have developed an entirely new way of approaching these complex problems, using simple diagrams as a tool to reveal better approaches to software optimization in deep-learning models.They say the new method makes addressing these complex tasks so simple that it can be reduced to a drawing that would fit on the back of a napkin.The new approach is described in the journal Transactions of Machine Learning Research, in a paper by incoming doctoral student Vincent Abbott and Professor Gioele Zardini of MIT’s Laboratory for Information and Decision Systems (LIDS).“We designed a new language to talk about these new systems,” Zardini says. This new diagram-based “language” is heavily based on something called category theory, he explains.It all has to do with designing the underlying architecture of computer algorithms — the programs that will actually end up sensing and controlling the various different parts of the system that’s being optimized. “The components are different pieces of an algorithm, and they have to talk to each other, exchange information, but also account for energy usage, memory consumption, and so on.” Such optimizations are notoriously difficult because each change in one part of the system can in turn cause changes in other parts, which can further affect other parts, and so on.The researchers decided to focus on the particular class of deep-learning algorithms, which are currently a hot topic of research. Deep learning is the basis of the large artificial intelligence models, including large language models such as ChatGPT and image-generation models such as Midjourney. These models manipulate data by a “deep” series of matrix multiplications interspersed with other operations. The numbers within matrices are parameters, and are updated during long training runs, allowing for complex patterns to be found. Models consist of billions of parameters, making computation expensive, and hence improved resource usage and optimization invaluable.Diagrams can represent details of the parallelized operations that deep-learning models consist of, revealing the relationships between algorithms and the parallelized graphics processing unit (GPU) hardware they run on, supplied by companies such as NVIDIA. “I’m very excited about this,” says Zardini, because “we seem to have found a language that very nicely describes deep learning algorithms, explicitly representing all the important things, which is the operators you use,” for example the energy consumption, the memory allocation, and any other parameter that you’re trying to optimize for.Much of the progress within deep learning has stemmed from resource efficiency optimizations. The latest DeepSeek model showed that a small team can compete with top models from OpenAI and other major labs by focusing on resource efficiency and the relationship between software and hardware. Typically, in deriving these optimizations, he says, “people need a lot of trial and error to discover new architectures.” For example, a widely used optimization program called FlashAttention took more than four years to develop, he says. 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Dept. of Fish & Game) Then, on April 7, Evans got a text message from the Land Trust’s land programs director, Leslie Chan, with a video that appeared to show a freshly hatched young-of-the-year — the wonky name for fish born during the steelheads’ sole annual spawn.The following day, Evans’ team was dispatched to the creek and confirmed the discovery. They tallied about 100 of the newly hatched fish. The young trout span roughly one inch and, as Evans put it, aren’t too bright. They hang out in the shallows and don’t bolt from predators.“They’re kind of just happy to be alive, and they’re not really trying to hide,” he said.By the end of summer, Evans estimates two-thirds will die off. But the survivors are enough to keep the population charging onward. 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(Christina House / Los Angeles Times) Evans expects it will be about four years before Topanga Creek is ready to support steelhead again, based on his experience observing streams recover after the Thomas, Woolsey, Alisal and other fires. There’s also discussion about moving around steelhead to create backup populations should calamity befall one, as well as boost genetic diversity of the rare fish.For example, some of the steelhead saved from Topanga could be moved to Malibu Creek, another stream in the Santa Monica Mountains that empties into Santa Monica Bay. There are efforts underway to remove the 100-foot Rindge Dam in Malibu Creek to open up more habitat for the fish.“As we saw, if you have one population in the Santa Monica Mountains and a fire happens, you could just lose it forever,” Evans said. “So having fish in multiple areas is the kind of way to defend against that.”With the Topanga Creek steelhead biding their time up north, it’s believed there are none currently inhabiting the Santa Monicas. Habitat restoration is key for the species’ survival, according to Evans, who advocates for directing funding to such efforts, including soon-to-come-online money from Proposition 4, a $10-billion bond measure to finance water, clean energy and other environmental projects.“It doesn’t matter how many fish you have, or if you’re growing them in a hatchery, or what you’re doing,” he said. “If they can’t be supported on the landscape, then there’s no point.”Some trout will end up making their temporary lodging permanent, according to Hendricks, of the Land Trust. Arroyo Hondo is a long creek with plenty of nooks and crannies for trout to hide in. So when it comes time to bring the steelhead home, she said, “I’m sure some will get left behind.”

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In this and its 2019 contract, the Chicago union also won “common good” items such as protections for immigrant students and teachers, and affordable housing–related measures. The new contract also guarantees teachers academic freedom at a time when the federal government is trying to limit schools from teaching materials related to diversity, equity, and inclusion. “Black history, Indigenous history, climate science — that’s protected instruction now,” said Potter. Chicago Public Schools did not respond to emailed questions for this story, except to forward a press release that did not mention clean energy provisions. Training Chicago’s students for clean energy jobs The union crafted its proposals based on discussions with three environmental and community organizations, Bianchi said — the Southeast Environmental Task Force, People for Community Recovery, and ONE Northside. The Southeast Environmental Task Force led the successful fight to ban new petcoke storage in Chicago, and the group’s co-executive director Olga Bautista is also vice president of the 21-member school board. People for Community Recovery was founded by Hazel Johnson, who is often known as “the mother of the environmental justice movement.” And ONE Northside emphasizes the link between clean energy and affordable housing. Clean energy job training was a priority for all three of the organizations, Potter said. Under the contract, the union and district officials will work with other labor unions to create pre-apprenticeship programs for students, which are crucial to entering the union-dominated building trades to install solar, do energy-efficiency overhauls, and electrify homes with heat pumps and other technology. The contract demands the district create one specific new clean energy jobs pathway program during each year of the four-year contract. It also mandates renovating schools for energy efficiency and installing modern HVAC systems, and orders the school district to work with trade unions to create opportunities for Chicago Public Schools students and graduates to be hired for such work. “The people in the community have identified jobs and economic justice as being essential for environmental justice,” said Bianchi. “I’ve mostly taught juniors and seniors; a lot expressed frustration that college is not their plan. They wish they could learn job skills to enter a trade.” Chicago schools progress on solar, energy efficiency, and electrification Installing solar could help the district meet its clean energy goals, which include sourcing 100% of its electricity from renewables by this year. The district has invested more than $6 million in energy efficiency and efficient lighting since 2018, and cut its carbon dioxide emissions by more than 27,000 metric tons, school district spokesperson Evan Moore told Canary Media last fall as contract negotiations were proceeding. The schools are eligible for subsidized solar panels under the state Illinois Shines program, and they can tap the federal 30% investment tax credit for solar arrays, with a new direct-pay option tailored to tax-exempt organizations like schools.

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Education

Costa Rica Proposes Strict Penalties for Illegal National Park Entries

Costa Rica is cracking down on illegal entries into its national parks and protected areas, citing dangers to visitors and environmental harm. Franz Tattenbach, Minister of Environment and Energy (MINAE), has called on lawmakers to approve a bill imposing fines of up to ¢2.3 million (approximately $4,400) on individuals and tour operators who access these areas without authorization. Over 500 unauthorized entries into Costa Rica’s 30 national parks and reserves, have been reported so far this year. High-risk areas like Poás, Turrialba, Rincón de la Vieja, and Arenal volcanoes are frequent targets, where illegal tours bypass safety protocols. Unscrupulous operators promote these “exclusive” experiences on social media, often lacking insurance, safety equipment, or trained guides. “These operators abandon clients if intercepted by authorities, leaving them vulnerable in hazardous areas,” Tattenbach said. Poás Volcano National Park, closed since March 26 due to seismic activity and ash emissions, remains a hotspot for illegal tours. The proposed bill, under discussion by MINAE and the National System of Conservation Areas (SINAC), would introduce fines ranging from ¢1.3 million to ¢2.3 million ($2,500 to $4,400) for unauthorized entry, targeting both operators and participants. If a rescue operation is required, involving the Costa Rican Red Cross or MINAE personnel, an additional fine of ¢2.3 million ($4,400) could be imposed. Current laws penalize illegal entry under Article 58 of Forestry Law 7575, with three months to three years in prison, but enforcement is inconsistent. The new bill aims to strengthen deterrence. “These hikes involve steep slopes, toxic gases, and the risk of volcanic eruptions, which can be fatal,” Tattenbach warned, citing the 2017 Poás eruption that closed the park for over a year. Illegal entries also threaten Costa Rica’s biodiversity, which includes 5% of the world’s species. Unauthorized trails disrupt ecosystems and increase risks of poaching, according to Jorge Mario Rodríguez, Vice Minister of Environment. The Volcanological and Seismological Observatory of Costa Rica (OVSICORI) monitors volcanic activity to inform park closures, but illegal tours undermine these safety measures. Increased Surveillance SINAC, the Costa Rican Fire Department, Red Cross, and Police Force will intensify surveillance going forward, targeting high-risk national parks and roadways to prevent unauthorized access, wildlife extraction, hunting, and trade in protected flora and fauna. “These operations safeguard our natural heritage and ensure visitor safety,” Tattenbach said. SINAC’s year-round efforts have intercepted numerous illegal tours in 2025. Visiting Parks Safely: MINAE and SINAC urge visitors to use authorized operators and purchase tickets via the SINAC website or park entrances. Guided tours, available through platforms like Viator or Get Your Guide, offer safe experiences in parks like Manuel Antonio or Corcovado. Tourists should check park statuses before planning visits, as closures due to volcanic activity or weather are common. “Respecting regulations protects both you and Costa Rica’s natural treasures,” Rodríguez said. Preserving Ecotourism: As the proposed bill awaits Legislative Assembly review, MINAE urges compliance to maintain Costa Rica’s status as a global conservation leader. For updates on the bill or park regulations, visit MINAE’s Website The post Costa Rica Proposes Strict Penalties for Illegal National Park Entries appeared first on The Tico Times | Costa Rica News | Travel | Real Estate.

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