Author: Tereza Pultarova

A bright "Saturn's ring" of satellites could circle the night sky if plans to launch a million data center spacecraft and tens of thousands of space mirrors come to pass. This ring, traversing the sky for hours after dusk and before dawn, would outshine every star and planet, and be visible from every spot on Earth.

Hugh Lewis, a professor of astronautics at the University of Birmingham in, the U.K., told Space.com that the only way to accommodate the high number of data center constellations that have been proposed is to stack them above another in orbit above the boundary between day and night, creating an artificial "Saturn's Ring" of satellites around the planet. That ring would show in the sky as a luminous band much brighter than any star or planet and even the full moon.

"If you were to look up at night, they would be all in one plane, really close together, going in the same direction," said Lewis. "The impact on the night sky would be absolutely catastrophic."

The next time you're away from urban light pollution, spend some time outdoors after dark and enjoy the view of the Milky Way and the constellations that have inspired awe since humankind woke to consciousness. Chances are those views are not here to stay forever.

Such a notion would have seemed like science fiction only a few years ago, but since the orbital data center frenzy kicked off last year, the once-fanciful prospect has become a distinct possibility.

A flurry of companies including SpaceX, Starcloud, Cowboy Space, Orbital and Blue Origin have applied to the U.S. Federal Communications Commission (FCC) for licenses to launch more than a million data center satellites combined. China has already jumped on that bandwagon, too, with plans to develop an orbital data center network within the next five years.

On top of those projects, California-based Reflect Orbital wants to launch 50,000 orbiting mirrors into space to reflect sunlight to solar power plants on Earth after dusk. Reflect Orbital received its license from the Federal Communications Commission (FCC) on Friday, July 10, to fly the first of these mirrors — a 60 by 60 feet (18 by 18 meter) demonstration satellite named Eärendil-1, which is expected to launch by the end of this year.

Lewis explained that all these data centers and mirrors would have to orbit Earth in the same orbital plane to have access to constant sunshine. This orbital plane follows the terminator line — the boundary between day and night — and takes the satellites over the planet's north and south poles.

"Orbital data centers and Reflect Orbital all tend to rely upon what these operators call 24 hours of sunlight in space," Lewis said. "To have that, you have to be in a particular orbit, which follows the dawn-dusk line. It's not like the Starlink megaconstellation, which is distributed around the Earth."

Samantha Lawler, an astronomer at University of Regina in the Canadian province of Saskatchewan, agrees with Lewis. Lawler and her colleagues used computer modelling to visualize the impact of several of the proposed data center fleets including SpaceX's Starmind, Blue Origin's Project Sunrise and the Stampede constellation proposed by Cowboy Space.

In those visualizations, satellites visible from the planet's surface not just outshine the visible stars, they also outnumber them. Lawler explained that as Earth turns under the terminator orbit, the Saturn's ring of satellites would move across the sky twice a day — in the early evening hours between 6 and 8 p.m. and just before dawn.

"[The ring] would pass overhead at the same time every night," Lawler said. "That means its effect would be worse during winter time than the summer time."

Lawler cautions that the visualizations are based on publicly available data and may not reflect the exact technical specifications of the satellites involved. The work has also not yet been peer-reviewed.

However, Lawler added that the scattered light from that ring would continue brightening the sky for up to two hours after it would sink below the horizon, just like the sun keeps illuminating the firmament after it sets.

"It would make our taxpayer-funded telescope time much less effective," Lawler said. "We could do a lot less science for the same cost, and many science cases, including the search for dangerous near Earth asteroids, would be seriously compromised."

There would be no escape from the view of the ring anywhere in the world.

The modelling shows that some of these constellations — Blue Origin's Project Sunrise in particular — would fly their satellites in an additional orbital inclination that would create the shape of X on top of the main "Saturn's ring."

"If you were close to the equator, you would virtually have this X shape of crawling satellites come up in the sky early in the morning and after sunset," said Lawler. Further up north, you would see this as two separate bands. One band would come up in the morning and the other would emerge as the sun sets."

The actual brightness of this "Saturn's ring" would depend on the exact number of the satellites in it. But researchers warn that as each Reflect Orbital's space mirror is bound to be at least as bright as Venus — the brightest object in the sky after the full moon — the luminosity of this band would be extreme.

An earlier study by the European Southern Observatory concluded that a constellation of 50,000 Reflect Orbital mirrors would increase the brightness of the night sky by up to 300 percent, making the world's most expensive telescopes effectively useless.

"Humanity has already fundamentally altered the cosmos to the point where Earth is now an artificial 'ringed planet' choked by satellites and space debris," astronomer and dark sky advocate John Barentine, told Space.com. "But projects like Reflect Orbital will turn those mostly now invisible rings into bright reflective tracks. We aren't talking about a just scattered field of bright, moving dots anymore.

"Rather, this is a permanent, artificial 'ring of Saturn' effect cutting right through the most critical twilight observing windows for global astronomy."

On paper, many of these projects seem to make sense. Data centers on Earth take up precious land. They require enormous amounts of water for cooling, strain power grids and generate greenhouse gas emissions. In space, cooling and access to electrical power would be free.

Reflect Orbital wants to deliver sunlight to Earth after dark to increase the yield of solar plants and agricultural farms, provide free, sustainable lighting to construction sites and illuminate disaster zones in search of missing persons. The company maintains that it works to minimize disruption to astronomy and intends to cooperate with the scientific community.

"Every stage of our development is guided by data — testing, measuring, listening and adapting," the company's spokesperson said in an email. "We are actively commissioning independent, third-party research on the impacts of our technology."

The astronomers who spoke to Space.com, however, unanimously claim that the Reflect Orbital constellation and astronomy cannot coexist. "If we have mirrors in orbit, astronomy is over," Lawler said .

The American Astronomical Society (AAS), issued a statement criticizing the FCC's decision to grant Reflect Orbital a license to fly its test satellite.

"Reflect Orbital's proposed satellite, which would reflect sunlight back to Earth at night, carries the potential for significant harm to our members and the broader community of those who depend on a dark night sky," the AAS wrote. "This harm could include damage to sensitive research telescope equipment, potential flash-blinding of pilots and drivers, and — as Reflect Orbital stated in its own FCC filings — potential permanent eye damage to anyone looking through a mid-sized telescope."

In the past, astronomers praised SpaceX for attempts to dim the Starlink satellites by using dark paint and special visors to reduce reflectiveness. But Lawler said that many of these attempts have been undone by SpaceX's gradual increase of the satellites' size. While first generation Starlinks were about 570 pounds (260 kilograms) in mass, the latest generation weigh more than 4,400 pounds (2,000 kilograms) each.

"They did a lot of work to make the satellites darker, but then they also made them bigger and put them on lower orbits, and that has made them much, much brighter," Lawler said. "You can see Starlink satellites everywhere even with the naked eye. They are very visible and they are all over the sky."

In its Order and Justification of Reflect Orbital's mission license, the FCC stated that "impacts on optical astronomy fall outside [FCC's] review and authorization."

"The Commission's rules do not address the protection of optical astronomy, and thus we decline to interpret commenters' concerns in connection with the Commission's mandate," the FCC wrote.

The astronomers, however, point out that no other regulatory body in the U.S. and outside has a say in awarding satellite licenses to US companies and reviewing applications with respect to impacts on the night sky and the wider environment.

"The FCC is the only agency that's regulating American satellite launches," said Lawler. "But if the FCC says that this is not their problem, then whose problem is it?"

The AAS in its statement called on the FCC to "consider all of the impacts of the satellite's use case."

"In the absence of another licensing agency that could take these considerations into account, we believe that it is critical for the FCC to consider all of the impacts of the satellite's use case," the AAS wrote.

Robert Massey, the executive director of the U.K. Royal Astronautical Society added: " This is setting a bad precedent and opening up to the full deployment of the constellation that could get to the 50,000 satellites in a few years. It's really disappointing that the FCC authorized this."

SpaceX's Starlink satellites made over 355,000 collision avoidance maneuvers throughout the past year, with each satellite now dodging debris and other spacecraft on an almost weekly basis.

The numbers are based on disclosures made by SpaceX in its latest semiannual report to the Federal Communications Commission (FCC). According to the latest report, Starlink satellites performed an overall 207,152 avoidance maneuvers between December 2025 and May 2026, up nearly 60,000 from the 148,696 reported in the previous half year. That brings the yearly total to over 355,000, more than three times as many as the constellation performed in 2024. On average, each Starlink satellite performed more than 40 space dodging maneuvers per year between June 1, 2025 and May 31, 2026.

Experts fear the situation might soon get out of hand. "I think we're heading towards a situation where there will be a collision involving an operational satellite in the constellation," Hugh Lewis, a space sustainability expert and professor of astronautics at the University of Birmingham in the U.K., told Space.com. "And it will not be for the lack of trying to avoid those things. It will be in spite of all those maneuvers."

The increase coincides with the growth of the internet-beaming constellation and the overall number of satellites in space in the past five years. Starlink grew from about 6,000 satellites in 2024 to more than 10,000 as of June 2026. Over the same time period, the overall number of operational spacecraft in orbit rose from around 10,000 to about 16,000.

The SpaceX constellation orbits at altitudes between 298 miles (480 km) and 342 miles (550 kilometers) and uses an autonomous collision avoidance system that initiates a maneuver when the probability of a collision appears higher than 3 in 10 million. Lewis says that although SpaceX is "doing an excellent job" managing orbital traffic, the steep growth cannot continue without risks.

"The avoidance maneuvers reduce the probability of a collision to about one in a million, which is so small that it's negligible," Lewis said. "The problem is that if you make a million maneuvers and you have a residual probability of one in a million, you end up with an aggregate risk across your entire constellation that you can't get rid of."

Lewis points out that with the expected continued rise in avoidance maneuvers (SpaceX has applied to the FCC to increase the size of its constellation to 100,000 satellites), SpaceX will have made a million avoidance maneuvers over the lifetime of the Starlink constellation as early as June 2027. By 2030, the constellation may be making more than a million maneuvers every year. At that point, the one in a million risk of a collision may no longer be negligible at all.

Tommaso Sgobba, the Director of the International Association for the Advancement of Space Safety, told Space.com that the increase in collision avoidance maneuvers is a predictable certainty.

"The more satellites you pack into [an orbital] shell, the more pairs of satellites exist that could potentially cross paths," Sgobba wrote in an email. "Adding satellites does not just add risk one unit at a time, it multiplies the number of possible pairings. Double the satellites in a shell and you roughly quadruple the number of pairs that need to be watched."

Sgobba also said that the collision probabilities predicted are highly inaccurate as the effects of air drag, which change frequently with space weather, are currently impossible to predict.

He said that due to the vast uncertainties in satellite trajectory predictions "operators lack tools to tell a real threat from statistical confusion," adding that "satellites are frequently dodging ghosts, burning fuel and shortening their operational lives in the process."

SpaceX, being the largest constellation currently in orbit, takes the bulk of responsibilities for orbital maneuvering. Instead of communicating with the other operator to decide who will make the dodge, Starlink satellites automatically avoid other objects — both space debris fragments or operational satellites — whenever there is a conjunction alert.

Other ambitious constellations, such as Amazon LEO or China's Thousand Sails, or Qianfan, are currently being deployed, actively adding to the high number of satellites operating in low Earth orbit.

Lewis said that the only way to safely manage multiple constellations is to make sure their orbits do not intersect. That, however, is not the case based on available information. The Thousand Sails constellation, in particular, is expected to occupy similar regions as Starlink. Many of the recently announced orbital data center projects want to launch into particular orbital regions that are convenient for their operations and are therefore likely to overlap.

"The safe thing to do is to separate the constellations," Lewis said. "But then you are talking about orbital carrying capacity and the first mover benefit, because if I go into a particular altitude with my constellation, then nobody else can use it."

Sgobba calls for predicted numbers of collision avoidance maneuvers based on satellite numbers to be mandatorily disclosed to regulators before applications are granted.

"Right now, there is no clear requirement for a company to say, before launch, how many collision avoidance maneuvers a constellation of this size and density will need every year and whether the satellites carry enough fuel and automation to actually perform them all," Sgobba wrote.

"In short, the crowding of orbit is not an accident waiting to happen. It is a manageable, predictable engineering workload and the argument worth making publicly is that regulators should be treating it that way, by asking for these numbers up front rather than reacting to headlines about near misses after the fact."

Tiny pieces of space junk only 2 inches (5 centimeters) in size are cluttering a valuable orbital region where some of the costliest satellites reside, a new study has found.

Researchers from the University of Warwick in the U.K. found that the geostationary orbit — a region of space at the altitude of 22,000 miles (36,000 kilometers) — is full of dangerous, previously unseen bits of space junk that could destroy satellites.

The geostationary orbit is quite unique. Satellites at this altitude circle Earth in sync with the planet's rotation, appearing permanently suspended above a fixed spot on the equator. A single satellite in the geostationary ring has a constant view of a vast portion of the globe. This feature has been taken advantage of for decades for things like TV broadcasting, internet delivery, Earth observation and weather monitoring. But, as it appears, those satellites might not be safe up there at all.

"The debris in geosynchronous orbit is a potential minefield," Stuart Eves, the study’s co-author and space consultant at SJE Space, said in a statement. "No one in their right mind would enter a terrestrial minefield without a mine detector. Similarly, no one in their right mind should launch a satellite to GEO without an adequate debris survey."

The researchers uncovered the previously invisible debris by re-examining a dataset from an earlier space debris survey conducted by astronomers using the 8.3-foot (2.54-meter) Isaac Newton Telescope in La Palma, Canary Islands. They ran the data through new image processing algorithms to distinguish smaller and much fainter fragments than was previously possible in the distant geostationary orbit.

"The blind stacking technique is a very powerful method for improving the sensitivity limit of astronomical datasets," Ben Cooke, a research fellow at the University of Warwick's Center for Space Domain Awareness and co-author of the paper, said in the statement. "It involves testing many potential paths in an image sequence along which hidden targets might be moving and stacking the images to help bring those targets above the noise floor. This project shows a successful, real-world application of the method."

The researchers found 25 previously missed debris tracks in the images, 80% of which were caused by previously unknown objects.

The finding is concerning as space debris at such high altitudes behaves differently from that circling closer to Earth. The residual atmosphere at 22,000 miles is almost non-existent, meaning there is no air drag to force the orbital clutter spiral into the atmosphere and burn up.

"Debris in the neighborhood of the geostationary belt is particularly concerning," James Blake, also a Warwick research fellow and the study’s co-author, said in the statement. "It's very far away, well above the Earth's atmosphere, so small objects tend to be incredibly faint and difficult to detect, and any debris that's generated will stick around indefinitely."

While orbits near Earth naturally clear up as the residual air at these altitudes slows the junk fragments down, at the higher altitude, the concentrations of such fragments will forever keep rising, making the region ever more tricky to operate in.

Moreover, the satellites that reside in this unique orbital region tend to be very large and expensive, designed for much longer missions than those making up megaconstellations in low Earth orbit. These satellites, frequently fitted with solar panels spanning 100 feet (30 meters) or more, can suffer substantial damage from a collision with the tiniest piece of junk.

"Pieces of space junk can be moving very quickly relative to one another, as much as several kilometers every second," Blake said. "The energies involved are really high, and even small debris can cause a lot of damage to very expensive satellites, so small things really matter."

The researchers are now looking to analyze additional images obtained by other telescopes around the world to get a fuller understanding of the scale of the debris contamination in the region.

The study was published in the Journal of Astronautical Sciences in June.

Imagine you're on a hike in a remote mountain range. Your hyperactive dog catches the scent of a deer and, powered by his hunter's instinct, disappears in the forest. He has a GPS tracker in his collar that can send his coordinates via the cellular network. But where you are, there is no mobile coverage. You keep whistling and calling but to no avail: your dog is nowhere to be seen.

That exact scenario prompted technologist Jonathan Bensamoun to develop what he describes as the world's first satellite-connected wearable device for dogs. Bensamoun is the founder and CEO of Fi, which has been manufacturing dog trackers since 2017. He first conceived the idea to make GPS devices for dogs when he adopted a young German shepherd named Thor and wanted to make sure that his hired dog walker wasn't cutting corners when taking him out for walks.

But even though the company had quickly grown into a market leader, Bensamoun kept hearing customers complain about the device's usefulness. That's where SpaceX's Starlink satellites came in.

"The number one complaint from customers is either 'I live in an area where the cellular network is not really good' or 'I get really worried about my dog when it's away from the typical suburban area. I am worried when it escapes the yard and runs into the woods," Bensamoun told Space.com.

When Starlink began delivering connectivity directly to smartphones in 2024, Bensamoun knew a solution to the problem was on its way. And on July 8, the world's first satellite dog tracking service came online.

The device combines a GPS receiver, which determines the dog's position in real time, and a simple battery-powered modem that connects to T-Mobile's cellular network, which partners with Space's Starlink system. When the dog's position registers outside a pre-defined zone, the owner receives a message via a smartphone app.

When no cell tower is within reach, the device links with an overflying Starlink satellite to complete the task. The dog owner can also set a geo fence around the dog, an area within which the dog is allowed to move without triggering an alert. When the dog crosses that virtual boundary, for example, escapes from the backyard, the tracker sends a message to the owner.

The device's battery lasts "multiple days", according to Fi, giving the desperate pet owner plenty of time to locate the refugee. To speed up the search, Fi enables the owner to send the dog signals — short bursts of vibrations or sounds — to entice it to come home voluntarily.

"You can train your dog with those vibrations and reward it with food every time they receive the vibration," said Bensamoun. "That way, they will start associating the vibration with their food being ready at home."

GPS tracking has been around for decades. In the animal realm, wild, endangered animals became the first to wear them in the 1990s. But those early devices were clunky and expensive, good for large mammals such as moose and caribou, but not fit for commercial use on pets. The technology finally shrunk to small enough dimensions in the early 2010s when first GPS dog trackers entered the market.

Today, some 11 million dogs worldwide are tracked or monitored by GPS in some form. Fi's new tracker — the Fi Ultra Direct-to-Cell tracker — takes the technology another step further by providing "nearly omnipresent connectivity," said Bensamoun.

A constellation of cubesats fitted with special detectors could sniff out nuclear weapons hidden on satellites launched by adversary nations, according to a new study.

In 2024, rumors began to swirl in military circles that Russia might be developing a space-borne nuclear weapon. At that time, two years into the war in Ukraine, Russia was well aware of how big a lifeline SpaceX's Starlink broadband constellation had been for the Ukrainians. Starlink has not only provided connectivity to ravaged cities and frontline troops but also helped Ukrainians counter-attack the Russian invaders more effectively.

Drones fitted with Starlink terminals could reach much more distant targets than those controlled via conventional radio links. As the Starlink signal is almost impossible to disrupt by jamming, the idea that Russia might consider wiping the megaconstellation out by brute force didn't seem impossible.

Researchers know that a nuclear detonation in orbit would flood the space around Earth with fast, energetic electrons. These particles would destroy most unhardened satellites within range, which would extend to orbits even hundreds of miles away from the explosion.

"It would make the low Earth orbit and very low Earth orbit — where the Starlink satellites are, where many reconnaissance and communications satellites are, and where the International Space Station is — uninhabitable for a long period of time," Areg Danagoulian, an associate professor of nuclear science and engineering at the Massachusetts Institute of Technology and the author of the new paper describing the proposed detection method, told Space.com.

"We would essentially not only lose the satellites in those orbits, we would lose those orbits for a few years," he added.

Humankind has already seen the effects of a nuclear explosion in space. In 1962, the U.S. detonated a 1.4-megaton hydrogen bomb at an altitude of 240 miles (400 kilometers) above the Pacific Ocean. Radiation from the explosion, known as the Starfish Prime test, destroyed one-third of all satellites in orbit at that time. Admittedly, there weren't that many up there — fewer than 100 — but the impact was far-reaching.

Today, a nuclear detonation in space would be a catastrophe. It would knock out internet-beaming constellations such as Starlink and Amazon Leo, as well as hundreds of Earth-observing satellites that keep an eye on the activity of adversary nations, the changing climate and areas struck by natural disasters.

No reliable way currently exists to detect and defuse a nuclear bomb in space. Danagoulian proposes a constellation of small "9U" cubesats, each one about the size of a large shoebox and each carrying a special detector capable of sensing radiation emitted by unexploded nulear bombs.

He explores a scenario in which Russia launches a suspected space nuke into an orbit with an altitude of 1,200 miles (2,000 km). That number is not random. In 2022, Russia's Kosmos 2553 satellite, orbiting at that exact altitude, triggered suspicions it might be testing components for a future orbital nuclear weapon.

Russia claims the satellite just observes Earth. At that altitude, the satellite passes through the Van Allen belt, a region of intense cosmic radiation trapped by Earth's magnetic field. Most of the belt stretches between altitudes of around 600 miles (1,000 km) to tens of thousands of miles, but in some areas the radiation can reach much closer to Earth's surface.

The interaction between the fissile material inside the nuke and the energetic particles from the radiation belt would create distinct signatures, Danagoulian said, which could help confirm whether a suspicious satellite carries a nuke or not.

"The thermonuclear weapon would contain a significant amount of uranium," Danagoulian said. "The high-energy protons [in the uranium] would break up when another proton is coming in and shred the nuclei. That would knock out a large number of neutrons. This interaction turns that device into a very intense neutron source that otherwise would not be there."

The process is known as proton-induced neutron spallation, which essentially means the ejection of fragments from material triggered by impacts of protons.

The detector satellite Danagoulian proposes would have to be able to get quite close to the suspect spacecraft — a few kilometers. The inspector spacecraft would carry a sensor combining two types of detectors. At the heart of the device is a neutron scintillator, which detects all incoming neutrons and protons. Around it is a "cage of diamond" detector that detects only neutrons — not protons. Such a set-up helps filter out the particles present in the environment naturally, said Danagoulian. In addition, by using two "planes of neutron detectors," the sensor can determine the direction from which the neutrons arrived.

"If the external diamond detector triggers and gives a signal, you can ignore the particle, because it's most likely a proton and not a neutron," said Danagoulian. "Once you identify those neutrons, by having those two detections, you can back project and find out where the neutron came from."

Danagoulian says such a nuke sniffer would have to be launched into an orbit aligned with that of the suspicious satellite and creep up as close as 2.5 miles (4 km) from it. It would then take about a week to gather enough measurements to confirm whether the object is hiding a nuke or not. A constellation of 10 such satellites could reduce the process to mere hours, Danagoulian said.

If a nuke were detected, the military could then try to jam the satellite's communications link from the ground, making it impossible for the adversary to remotely detonate the bomb. There is currently no technology available to safely defuse a nuclear weapon in space.

The United Nations Outer Space Treaty, which provides the legal foundation for humankind's use of outer space, bans the use of nuclear weapons in orbit. However, the treaty has no means to ensure compliance.

Other approaches to nuke detection in space have been explored, including maneuverable X-ray satellites, but those would be quite a bit more complex and expensive.

Danagoulian also suggests that high-grade radiation hardening could improve satellites' chances of surviving a nuclear winter in space.

The paper was published online in the journal Nature today (July 8).

The American Earth-observation company Vantor maps Earth from space in 3D. The images are available in near-real time, revealing immediate effects of natural disasters and armed conflict. What is more, the images are also absolutely stunning.

Vantor, which operates a fleet of 10 satellites that image the surface of the planet with a resolution of 12 inches (30 centimetres), released the first set of its 3D shots from space on July 1. The images capture a variety of targets, all in amazing detail.

For example, there are shots of iconic landmarks in Paris; the Eiffel Tower, the Arc de Triomphe and the modernist quarter La Défense emerge in the images as if seen from a landing plane. Other image sets track the progress of ship-building activity at China's Yulin Naval Base and decreasing water levels at Arizona's Hoover Dam.

the standard resolution of 20 inches (50 cm) with an accuracy of 13 feet (4 meters) in all directions, and the HD version with a 6-inch (15 cm) resolution and a 10-foot (3 m) accuracy in all dimensions.

The 3D views are created by combining multiple satellite images taken from different angles and are updated every 24 hours or less to track even the most rapidly occurring changes in the landscape. The images form a basis for 3D maps that could, for example, help autonomous drones navigate in areas hit by GPS jamming.

The satellite fleet's ability to rapidly update the imagery is a unique feature that was impossible to achieve by other 3D mapping technologies. Most commonly, mapmakers and organizations would have to conduct costly imaging campaigns from aboard aircraft or using remotely controlled drones. Neither of these approaches, however, allows such regular and frequent revisits, according to Vantor. On top of that, drones and planes may not be able to safely access and map areas controlled by unfriendly nations.

"From command and control to autonomous systems operating in GPS-denied environments, many of today's most complex missions require current, accurate 3D terrain," Peter Wilczynski, chief product officer at Vantor, said in a statement.

"With WorldView 3D, customers can update the specific areas they care about, including remote and contested areas where traditional aircraft collection is limited, with unmatched speed and scale," Wilczynski added. "This is the future of spatial intelligence."