Discovery of a giant volcanic cave on Venus

 Existence of a giant volcanic cave on Venus confirmed by scientists 

For decades, scientists suspected that Venus might hide massive lava-formed tunnels beneath its scorched surface, but clear evidence had remained elusive. Now, a newly analyzed radar signal has confirmed what researchers long suspected: an empty volcanic tunnel lies beneath one of the planet’s collapsed surface pits. A team of planetary scientists has confirmed the existence of a giant volcanic cave beneath the surface of Venus, providing the first direct evidence of intact underground lava tunnels on the planet. The discovery transforms decades of geological speculation into a concrete target for exploration and offers new insights into Venusian volcanism and surface formation. Radar data confirms the first known underground lava tube on Venus, revealing a vast hidden volcanic world. The discovery offers the first direct indication that Venus hosts intact underground lava tubes, turning a long-standing geological hypothesis into an observable feature of the planet’s landscape. It also opens a new window into how Venusian volcanoes once shaped the crust.

Venus’s dense, cloud-covered atmosphere has long frustrated attempts to map its surface with visible-light imaging. Instead, researchers rely on radar, which penetrates the thick clouds and reflects back detailed surface features. By analyzing data from NASA’s Magellan spacecraft (1990–1992), a team led by Lorenzo Bruzzone at the University of Trento detected an unusual radar signature in a collapse pit near Nyx Mons, a volcanic rise on Venus. Rather than stopping sharply at the pit’s edge, the radar signal extended beyond the rim, indicating an interior hollow space beneath the crust. “The identification of a volcanic cavity is therefore of particular importance, as it allows us to validate theories that for many years have only hypothesized their existence,” said Bruzzone. The bright radar streak, paired with a shadowed region suggesting roof collapse, closely mirrors signals observed in lava tube skylights on Earth, supporting the interpretation of a subsurface conduit rather than a simple surface depression. Not every collapse pit leads to an underground tunnel, so the researchers asked whether this feature could be something else. Steep-walled craters and volcanic vents produce radar brightening which hugs the rim, not a long return from inside. Venus skylight in the Nyx Mons region reveals a subsurface cave, hypothesized to be a lava tube. The feature was identified through analysis of radar images acquired by the SAR instrument aboard the NASA Magellan mission. 

Measurements indicate the opening spans approximately 0.6 miles across, significantly wider than most terrestrial lava tubes. The roof above the cavity appears at least 490 feet thick, while the empty chamber beneath rises over 1,230 feet, creating a vast internal space. The feature was identified through analysis of radar images acquired by the SAR instrument aboard the NASA Magellan mission. These dimensions suggest that Venus’s lower gravity and dense atmosphere may allow lava crusts to form faster and thicker than on Earth, enabling unusually wide tunnels to remain structurally stable. Lava tubes form when flowing molten rock develops a hardened surface layer while molten lava continues to move beneath. Once the lava drains or diverts, the channel remains hollow. On Venus, this process appears capable of producing enormous underground passages, potentially linking multiple collapse pits along long chains which stretch for hundreds of miles across the planet. Venus’s thick cloud cover blocks visible-light cameras, leaving radar as the primary way to map the planet’s surface. Between 1990 and 1992, NASA’s Magellan spacecraft used Synthetic Aperture Radar, a technique that converts reflected radio waves into images, to chart much of the planet. Decades later, scientists still rely on those maps because no later orbiter has matched their near-global coverage. Within one standout collapse pit, the radar image showed an unusual bright streak extending beyond the rim instead of stopping sharply at the surface.

Bruzzone’s team interpreted that glow as strong backscatter, radar energy bouncing from interior walls that the beam briefly illuminated. A deep shadow beside the streak suggested part of the roof had collapsed, leaving an opening large enough for radar signals to penetrate. Similar bright-and-dark signatures appear over lava-tube skylights on Earth, strengthening the case that the Venusian pit connects to an underground cavity rather than being a simple surface depression. Long chains of collapse pits run across Venus’s surface, hinting at the possibility of interconnected underground tunnels. The Nyx Mons pit lies along one such chain, with terrain slopes and nearby pits suggesting that the tunnel could extend roughly 28 miles beyond the confirmed opening. While some pits may be blocked by debris, the distinctive radar signature of Nyx Mons provides a rare confirmation of open subsurface space. Each new collapse pit with similar radar features may guide scientists to other intact lava tubes, offering fresh insights into Venus’s volcanic past and the evolution of its crust. Lorenzo Bruzzone at the University of Trento documented a hollow conduit extending beyond the pit’s rim. Instead of a simple crater with steep walls, the structure produced a prolonged interior echo that signaled open space beneath the crust. Because only the portion closest to the opening can be confirmed, the discovery establishes the tunnel’s presence on Venus while leaving its full extent to be determined.

This discovery marks a turning point for Venusian geological research. Until now, the existence of underground lava tubes had only been theoretical. The newly identified tunnel near Nyx Mons provides a tangible site for future observation, and its presence raises questions about the extent of subsurface volcanic networks. Researchers classify the structure as a candidate lava tube, similar to ones previously suggested on Mars and the Moon. Such tunnels form when flowing lava develops a hardened surface crust while molten material continues moving beneath it. When the lava supply later drains or shifts course, the hollow channel remains. On Venus, the planet’s lower gravity and dense atmosphere may allow thicker crusts to form more quickly, helping unusually wide conduits stay open. The new discovery fits that scenario, though scientists note that tunnel size likely depends on local volcanic conditions rather than planet-wide rules. Magellan’s radar pixels were relatively large, allowing only the biggest collapse pits to stand out clearly. Each pixel covered roughly 250 feet, meaning smaller skylights, roof-collapse openings into underground tunnels, could easily disappear at that scale. Because the radar illuminated only part of the opening, researchers confirmed the tunnel near the skylight but could not determine how far the conduit extends or whether rubble blocks sections farther inside. Upcoming missions aim to fill those gaps. ESA’s EnVision orbiter plans to use ground-penetrating radar capable of probing roughly 3,300 feet below the surface, while NASA’s VERITAS mission will deliver far sharper radar maps and detailed topography. Together, these missions could reveal additional hidden tunnels, trace collapse chains more precisely and determine whether the newly identified conduit is part of a larger underground network.

Long chains of collapse pits run for hundreds of miles across Venus, and the Nyx Mons feature lies along one such chain. Nearby terrain slopes and surrounding pits suggest the subsurface conduit could extend about 28 miles beyond the confirmed opening, while other pits in the same chain lack this distinctive pattern, a sign that collapse debris may have sealed their entrances. Future surveys can trace these chains and flag the rare locations where the same signal appears, pointing to possible open underground spaces. The discovery means that a surface pit now connects directly to an underground tunnel, transforming long-standing speculation into a specific exploration target. Sharper radar maps should reveal whether additional conduits remain hidden beneath the crust or whether this tunnel formed under unusually rare local conditions. The discovery not only validates long-standing hypotheses about Venusian geology but also establishes specific targets for exploration. The tunnel’s dimensions, location, and radar signature provide a model for identifying other potential lava tubes and understanding the role of subsurface volcanism in shaping Venus’s landscape. Future studies may answer fundamental questions about how volcanic activity and atmospheric conditions interact to create such vast underground cavities. By combining high-resolution radar mapping with advanced modeling, researchers hope to chart a previously invisible layer of Venusian geology, opening new possibilities for planetary science and comparative studies with Mars and the Moon in our universe.

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Safe drinking water from solar-powered Hydrogel

 Create free clean drinking water from solar-powered Hydrogel  

Researchers from Stanford University and MIT have developed a longer-lasting hydrogel that can pull moisture from the air and turn it into drinkable water using sunlight. During testing, the hydrogel, made with a moisture-absorbing salt and a polymer commonly found in diapers, produced up to two liters of drinking water a day. Researchers at Stanford and MIT improved the hydrogel which captures moisture from air and releases it as drinkable water using only sunlight. Adding an anti-corrosion coating significantly increased the material’s durability, allowing it to last more than eight months and over 190 harvesting cycles without contaminating the water. While still in early stages, the system could eventually produce water for about one cent/liter and provide a low-cost option in extremely dry environments. One in four people on Earth lacks reliable access to safe drinking water, according to the WHO. With this option, people may have a solution, even for those living in the most bone-dry desert on the planet. The work could help people in dry regions where traditional water sources are limited. WHO and UNICEF reported in 2025 that 2.1 billion people, still lacked access to safely managed drinking water.

Hydrogels are soft, sponge-like materials made from water-absorbing polymers which can hold large amounts of liquid. They're already used in everyday products like diapers, contact lenses, wound dressings and some beauty products. In this case, researchers combined a hydrogel with lithium chloride, a highly absorbent salt which pulls moisture from the air, even in extremely dry climates. When heated by sunlight, the material releases that moisture as water vapor, which can then be condensed into drinkable water. The material is a sponge-like mix of lithium chloride and polyacrylamide. Lithium chloride is a highly absorbent salt, while polyacrylamide is a polymer. Earlier field testing in Chile’s Atacama Desert used a panel of the material mounted on a black-painted aluminum sheet. The sheet absorbed heat from the sun and helped the hydrogel release collected water. Carlos Diaz-Marin, assistant professor of energy science and engineering at Stanford’s Doerr School of Sustainability and co-lead author of the study, said the improvement could eventually bring the cost of water produced this way to about one cent/liter. This would be about 1% of the cost of bottled water and close to the cost of tap water in some US cities, Stanford reported.

The research team published their findings in Nature Communications after testing a material called a hydrogel, a sponge-like combination of salt and polymer that scientists have been working to perfect for years to extract moisture from thin air. The sponge can then release the collected droplets as drinkable water using nothing but sunlight. The team explained that the product had been tested in the past but had fallen apart too quickly to be practical. "To our knowledge, nobody had thought of durability and degradation of these materials, despite it being a critical parameter for water production," Carlos Diaz-Marin, said. The current design can produce up to two liters of water/day using a thin layer of material spread across a panel roughly the size of a bath towel. Stanford said that is around the amount generally needed per person per day for basic health during emergencies. Diaz-Marin wants to increase the output. This could make the system more useful for rural communities in dry inland regions where desalination is not practical.

The hydrogel, the team explained, is made from two familiar ingredients: lithium chloride, a superabsorbent salt and polyacrylamide. In earlier field testing in Chile's Atacama Desert, which ranks among the driest places on Earth, a team of researchers deployed a "cookie-sheet-sized" panel (their descriptor, not ours, though rather appropriate for Food & Wine) of the material. During the day, the black-painted aluminum sheet absorbed heat from the sun, warming the hydrogel and causing it to release water as vapor, which was then condensed into drinkable liquid. However, the material only survived about 30 of those fill-and-release cycles before breaking down, which was nowhere near enough to make it economically viable or safe. This created both cost and safety concerns because degraded salt or polymer could enter the condenser and affect water quality. After four years of lab work, the team found that the metal surface holding the hydrogel was causing the problem. The metal released ions that formed damaging radicals inside the gel, which then broke down the polymer chains. The researchers fixed the issue by adding a commercial anti-corrosion coating to the metal. The coating blocked the ions from reaching the hydrogel. With the coating in place, the hydrogel stayed stable for more than eight months in stress testing and lasted for more than 190 water harvesting cycles. "Any degradation could make either the salt or the polymer go into the condenser," Diaz-Marin said. "That would basically destroy the potability of the water."

The paper said the coating strategy allowed stable moisture absorption and release for more than 190 cycles over 96 days. It also said the approach could create a path toward producing water from air for less than $0.01/liter. The technology is not ready for large-scale deployment yet, but the researchers are working to improve efficiency and reduce cost. The metal casing, which they noted is necessary for conducting the sun's heat, was releasing ions that generated damaging radicals inside the gel, which then chewed through the polymer chains. "The radicals are very efficient at eating the polymer away," Diaz-Marin said. The good news is that the fix is straightforward. All they needed to do was coat the metal with a commercial anti-corrosion coating to block those ions from ever reaching the gel. "These new hydrogels are exceptionally exciting because they give us a way to produce potable drinking water in really extreme conditions," co-lead author Chad Wilson, who worked on the hydrogel as a graduate student at MIT, added. The hydrogel approach is one of several emerging technologies designed to pull water from the air. Other researchers are also studying metal-organic frameworks, which can capture water at very low humidity levels. The new work shows that durability may be just as important as water capture itself. Without a longer-lasting material, water harvesting from air would remain too expensive and unreliable for practical use.

Diaz-Marin said that "We see a path to this technology to perhaps even being competitive with tap water,". The current design produces up to two liters of water/day, enough to meet a person's basic needs in an emergency. But Diaz-Marin wants five liters, to ensure that even those living in rural communities in arid regions where desalination isn't an option can have all the water they need. "There are a lot of people who don't have access to water or have to walk hundreds of hours per year to procure water," Diaz-Marin said. "We believe this could potentially be a way to provide additional water resources." While the technology isn't ready for large-scale deployment yet, Diaz-Marin said they are working on it quickly.  This isn't the only technology emerging that can pull water from the air. In April, F&W also reported on metal-organic frameworks, which can trap water at relative humidity levels as low as 10%, which is technically lower than the average humidity in Death Valley, California. Metal-organic frameworks are still in the early stages, too, but with the world entering a state of global water bankruptcy, these scientific findings can't come soon enough to help the effected areas.

Muhammad (Peace be upon him) Name