More evidence has emerged to support the natural origin of comet 3I/Atlas. After several weeks of conspiracy theories, social media debates, and speculation on popular podcasts such as Joe Rogan's, this interstellar object is still a comet. The most recent confirmation came from an observatory in South Africa that detected the first radio signal from 3I/Atlas.

But how? A radio signal? That would have to confirm the object is technlogical in nature, wouldn't it? The thing is, this isn't a radio signal like a transmission emitted by a spacecraft. It's instead a radio frequency pattern detected by MeerKAT, a radio telescope composed of 64 antennas—each with a diameter of 13.5 meters—operated by the South African Radio Astronomy Observatory. And what did it detect? "OH absorption was detected on the 1665 MHz and 1667 MHz lines," according to the researchers.

What MeerKAT specifically detected were lines of radio absorption by hydroxyl radicals, that is, OH molecules, a pattern that would be consistent with typical comet activity. The lines appear as absorption because 3I/Atlas was very close to the sun and the observing geometry favors absorption over emission. This is the phenomenon explained in WIRED a few days ago when the controversy about non-gravitational acceleration arose: When comets reach their closest point to the sun, they sublimate ice into space and receive a greater amount of radiation. This also causes them to alter their trajectory.

The hydroxyl radical (OH) can absorb or emit radiation at specific frequencies (such as the 1665 and 1667 MHz lines) due to transitions in its energy levels. These OH spectral lines have been detected in nebulae, comets, and star-forming regions. OH helps astronomers map the star- and water-born regions of the universe because it can "glow" brightly at radio frequencies under certain conditions.

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If there is, or ever has been, life on Mars, the chances are it would exist in caves protected from the severe dust storms, extreme temperatures, and high radiation present on its surface. One place to focus our attention could be eight possible cave sites (called skylights) recently discovered by Chenyu Ding at Shenzhen University in China, and colleagues.

Cave discovery
In a paper published in The Astrophysical Journal Letters, the team presents the first evidence of a new type of cave on the red planet, formed by water dissolving rock. Most Martian caves discovered so far have been lava tubes, but the study authors argue that they have identified the first documented karstic caves on Mars.

"These skylights are interpreted as the first known potential karstic caves on Mars, representing collapse entrances formed through the dissolution of water-soluble lithologies—defining a new cave-forming class distinct from all previously reported volcanic and tectonic skylights," wrote the researchers.

On Earth, karstic caves are typically formed when water dissolves soluble rock such as limestone or gypsum, creating and enlarging underground cracks and fractures that grow large enough to become caves. The paper proposes a similar process on Mars, where ancient Martian water may have dissolved carbonate- and sulfate-rich rocks on the crust.

The caves are located in the Hebrus Valles, a northwestern region, and are eight pits that were mapped by previous Mars missions. They are deep and predominantly circular depressions, not impact craters, which typically have raised rims and ejected debris around them.

You might’ve heard we’re trying to talk to whales. It sounds crazy, but it’s not so far-fetched, as in recent years we’ve been getting closer and closer to cracking the code of their remarkably complex communications.

Now, a groundbreaking discovery has been made through eavesdropping on the conversations of sperm whales (Physeter macrocephalus). It turns out they use single and double vowel sounds in their vocalizations, sort of like how we might say “did” or “died”. Combining vowels like that is called a diphthong, and the existence of a comparative feature in whale communications has the potential to upend what we thought we knew about non-human intelligence.

"This discovery opens an entirely new chapter in our understanding of sperm whale communication,” said David Gruber, Founder and President of Project CETI, in a statement emailed to IFLScience. “By integrating linguistics and non-human communication, we are now aware that sperm whales have vowel- and diphthong-like structures in their voices, and that they evolved an entirely independent way of producing vowels.”

Studying "animal language"
Studying animal communications is very difficult for a human as, despite our best scientific efforts, we can’t help but approach it with the biases of Homo sapiens communication. A key moment for Project CETI – the organization that’s leading the charge in decoding whale vocalizations – was finding a way to move these biases to one side.

One such bias centers around timing, as our speech is created through vocal folds that vibrate much faster than the phonic lips used by cetaceans. So, if we’re going to get to grips with their "language" (we don't yet know if animals have language, FYI), we need to slow things down a bit.

Sperm whale vocalizations
Once that difference in timing was accounted for, the CETI scientists noticed something amazing: there were patterns so clear within sperm whale vocalizations that they could be transcribed using human letters (perhaps Dory’s attempt at speaking Whale wasn’t so ridiculous after all). These vowel-like sounds were clicks accented through modulation of their frequency with “a” and “i” sounds.

Those sounds could also be combined to create a diphthong-like vocal feature. That they were doing this in a structured and repeatable way suggests that these nuanced adjustments to their codas are crucial to getting their point across.

Thanks to the European Space Agency (ESA) spacecraft XMM-Newton, astronomers have seen a powerful explosion of plasma erupting from a distant star for the first time. We have seen (and felt) plenty of these coronal mass ejections (CMEs) from the sun, but even though we have long thought other stars expel such powerful outflows of superheated gas and magnetic field, astronomers had never before spotted them in any convincing way.

This first extra-solar CME, which erupted from a red dwarf star, wasn't any run-of-the-mill stellar blast either. This CME was dense enough and carried enough energy to strip away the atmosphere of any closely orbiting planet, with the ejected material traveling at 5.4 million miles per hour (2,400 kilometers per second). That speed, around 3,500 times as fast as a Lockheed Martin F-16 jet fighter, is something that is only observed in around 1 in 2,000 CMEs from our sun.

The atmosphere-stripping potential of this outburst means the observation of this CME could help astronomers better refine which extrasolar planets, or exoplanets, orbiting distant stars are capable of supporting life.

As if dark energy weren't already mysterious and baffling enough, new research suggests that this unknown force may not be driving galaxies apart at an accelerating rate anymore.

This remarkable result comes from research that suggests that the expansion of the universe has already begun to slow, contrary to the currently favored belief that dark energy is still accelerating the expansion of the cosmos. The discovery also follows results from the Dark Energy Spectroscopic Instrument (DESI) that last year indicated that dark energy is weakening.

This research could not only revolutionize our understanding of the universe as it is today, but also offer clues about how our cosmos will end. If dark energy has already lost the battle against gravity, the next step after slowing cosmic expansion could be the contraction of space, and that could suggest the universe will end in a "Big Crunch" scenario akin to the Big Bang playing in reverse.

The researchers behind this discovery are already hailing it as a possible paradigm shift in how we think about the very nature of the universe. "Our study shows that the universe has already entered a phase of decelerated expansion at the present epoch and that dark energy evolves with time much more rapidly than previously thought," Young-Wook Lee, team leader and researcher at Yonsei University in South Korea, said in a statement. "If these results are confirmed, it would mark a major paradigm shift in cosmology since the discovery of dark energy 27 years ago."

Jeff Bezos's Blue Origin successfully launched its New Glenn rocket on Thursday with NASA twin spacecraft destined for Mars aboard, and in a breakthrough, nailed the landing of its booster.

The launch was stalled for days over weather both on Earth and in space, but it was worth the wait: in the rocket's second-ever flight, Blue Origin managed to recover the booster for reuse.

Ecstatic cheers rang out at the launch site in Florida's Cape Canaveral as the booster gracefully stuck its landing on a floating platform. Prior to Thursday, only Elon Musk's SpaceX had managed to accomplish such a maneuver with an orbital-class rocket.

Tuberculosis remains the world's leading infectious killer, claiming an estimated 1.23 million lives last year, the UN health organisation said Wednesday as it warned that recent gains made against the disease were fragile.

Deaths from TB were down three percent from 2023, while cases dropped by nearly two percent, the World Health Organization (WHO) said in its annual overview.

An estimated 10.7 million people worldwide fell ill with TB in 2024: 5.8 million men, 3.7 million women, and 1.2 million children.

A preventable and curable disease, tuberculosis is caused by bacteria that most often affect the lungs. It spreads through the air when people with TB cough, sneeze, or spit.

Now, TB cases and deaths are both declining "for the first time since the Covid-19 pandemic", which disrupted services, said Tereza Kasaeva, head of the WHO department for HIV, TB, hepatitis, and sexually transmitted infections.

"Funding cuts and persistent drivers of the epidemic threaten to undo hard-won gains, but with political commitment, sustained investment, and global solidarity, we can turn the tide and end this ancient killer once and for all," she said.

Funding for the fight against TB has stagnated since 2020.

Last year, $5.9 billion was available for prevention, diagnosis, and treatment – way off the target of $22 billion annually by 2027.

Serotonin is often described as the happiness chemical because of its well-known role in regulating mood.

However, recent research suggests this familiar molecule may play an unexpected role in cancer development. Not through its effects on the brain, but through a completely different mechanism in other parts of the body.

Despite serotonin being commonly associated with the brain, almost 95% of the body's serotonin is produced in the gut. From there, it enters the bloodstream and travels to various organs and tissues, including the liver, pancreas, muscles, bones, fat tissue, and immune cells.

Gut serotonin helps regulate blood sugar levels through its actions on the liver and pancreas, and regulates body temperature by acting on fat tissue.

It also contributes to maintaining healthy bones, stimulating appetite and gut motility, stimulating sexual health, promoting wound healing, and supporting immunity against harmful microbes. It essentially drives the functions of many cells throughout the body, and its effects extend far beyond mood regulation.

In 2019, scientists at the Icahn School of Medicine at Mount Sinai in New York discovered that serotonin can enter cells and interact directly with DNA. They found that it binds to molecular "switches" that control whether genes are active or inactive – and this binding can turn specific genes on.

Studies since then have shown that serotonin can switch on genes involved in cancer growth. This mechanism has been seen in brain, liver, and pancreatic cancers – and it may play a role in many other types of cancer.

Identifying the specific sites where serotonin binds to cancer-related genes could support the development of targeted "epigenetic" therapies – treatments that control which genes are switched on or off.

The world is undergoing rapid electronification and digital transformation, reshaping how we live. Many of us have numerous electronic devices around us at all times, from smartphones and watches to our home appliances and cars.

A sharp increase in e-waste has accompanied the surge in electronic equipment. In 2022, 62 million tons of e-waste was produced globally.

Canada's e-waste tripled between 2000 and 2019 and is expected to reach 1.2 billion kilograms by 2030. These statistics demonstrate an urgent environmental crisis that demands new ways of thinking and educating future generations.

A key part of tackling the problem is educating people about it. As educators, we need to expand school education to include resource recovery, sustainability and pro-environmental behaviors to inform students on what to do with their old gadgets.

New research from astrophysicists at Michigan State University may bring scientists closer to solving a mystery that has puzzled them for more than a century: where do galactic cosmic rays come from?

Cosmic rays are high-energy particles that travel at nearly the speed of light. They originate from locations both within the Milky Way and beyond, yet their exact sources have remained unknown since their discovery in 1912.

Shuo Zhang, an assistant professor of physics and astronomy at MSU, and her research team led two recent studies offering new insights into where these particles may have formed. The findings were presented at the 246th meeting of the American Astronomical Society in Anchorage, Alaska.

These energetic particles are believed to come from some of the universe’s most extreme environments, including black holes, supernova remnants, and regions where stars are born. Such astrophysical events also generate neutrinos, which are tiny, nearly massless particles found throughout the cosmos and even here on Earth.

“Cosmic rays are a lot more relevant to life on Earth than you might think,” Zhang said. “About 100 trillion cosmic neutrinos from far, far away sources like black holes pass through your body every second. Don’t you want to know where they came from?”

The Universe’s Ultimate Accelerators
The sources of cosmic rays are so powerful that they can accelerate protons and electrons to energy levels far exceeding what is possible with even the most advanced human-made particle accelerators. Zhang’s group focuses on these natural cosmic accelerators, known as PeVatrons, to understand where they exist, what they are made of, and how they propel particles to such extreme energies.

Gaining a deeper understanding of these mechanisms could help answer fundamental questions about galaxy evolution and the mysterious nature of dark matter.

A team of scientists at The University of Texas at Austin has created a cleaner and more efficient way to extract rare earth elements, which are vital for technologies such as electric vehicle batteries and smartphones. The technique could strengthen domestic production and lessen dependence on expensive imports.

The new process makes it possible to separate and collect rare earth elements from sources that were previously too difficult or inefficient to use, offering a potential solution to supply challenges heightened by global trade tensions.

“Rare earth elements are the backbone of advanced technologies, but their extraction and purification are energy intensive and extremely difficult to implement at the scales required,” said Manish Kumar, professor in the Cockrell School of Engineering’s Fariborz Maseeh Department of Civil, Architectural and Environmental Engineering and the McKetta Department of Chemical Engineering. “Our work aims to change that, inspired by the natural world.”​

The study, recently published in ACS Nano, describes how the team engineered artificial membrane channels, tiny pores within membranes, that imitate the highly selective transport systems of natural proteins in living organisms. In biology, such channels guide ions as they move between cells.

Each channel has unique properties that allow only ions with specific traits to pass through while blocking others. This fine-tuned selectivity is essential for many biological functions, including the way the human brain processes information.

When Nebraska woman Alex Simpson was just two months old, she was diagnosed with a rare congenital brain condition that meant she may not survive to her first birthday.

But despite medical odds, she and her family just celebrated her 20th birthday on November 4 this year.

Simpson's condition, hydranencephaly, means her cerebral hemispheres – the two large lobes that typically make up most of the human brain, responsible for cognitive function, voluntary movement, and sensory processing – are almost nonexistent. While her brainstem and some other brain parts remain, the rest of her cranial cavity is filled instead with cerebrospinal fluid.

Hydraencephaly is incurable, and is managed with intensive supportive care.

"Technically, she has about half the size of my pinky finger of her cerebellum in the back part of her brain, but that's all that's there," Alex's father, Shawn Simpson, told Omaha news station KETV earlier this month.

This means Simpson's vision and hearing are impaired, though her cerebellum maintains some awareness of her surroundings. Her family say they nevertheless have a strong relationship with her.

We don't know what causes hydranencephaly, but some research suggests it may arise when some form of vascular injury, such as a stroke or infection, blocks blood supply to the brain.

Tracking time is one of those things that seems easy, until you really start to get into the details of what time actually is. We define a second as 9,192,631,770 oscillations of a cesium atom. However, according to Einstein’s theory of general relativity, mass slows down these oscillations, making time appear to move more slowly for objects in large gravity wells. This distinction becomes critical as we start considering how to keep track of time between two separate gravity wells of varying strengths, such as on the Earth and the Moon. A new paper pre-print on arXiv by Pascale Defraigne at the Royal Observatory of Belgium and her co-authors discusses some potential frameworks for solving that problem and settles on using the new Lunar Coordinate Time (TCL) suggested by the International Astronomical Union (IAU).

So why is this a problem we should solve now? As humanity is preparing to go back to the moon, hopefully more permanently this time, we need some standardized way to navigate it. In support of their various crewed lunar missions, America, China, and the EU are working on programs that can provide Position, Navigation, and Timing (PNT) services to explorers, and importantly network infrastructure, on the Moon.

Each of these services hopes to provide meter-level accuracy for a network node’s position on the Moon, but to do so would require nanosecond-level precision in their synchronized clocks. Similarly, Earth-based satellites like GPS have to account for relativistic changes in time between the geosynchronous satellites barely in the planet’s gravity well and the users down on the surface. To help facilitate this process on the Moon, in 2024 the IAU came up with the LUnar Celestial Reference System (LCRS), and an associated coordinate time - TCL.

A weak spot in Earth's protective magnetic field is growing larger and exposing orbiting satellites and astronauts to more solar radiation, according to more than a decade of measurements by three orbiting observatories.

The observations by the European Space Agency's Swarm trio of satellites found that Earth's already weak magnetic field over the South Atlantic Ocean — a region known as the South Atlantic Anomaly (SAA) — is getting worse and that it has grown by an area half the size of continental Europe since 2014. At the same time, a region over Canada where the field is particularly strong has shrunk, while another strong field region in Siberia has grown, the measurements show.

"The region of weak magnetic field in the South Atlantic has continued to increase in size over the past 11 years since the launch of the Swarm satellite constellation," explained Chris Finlay, a geomagnetism researcher at the Danmarks Tekniske Universitet. "Although its growth was expected based on early observations, it is important to confirm this change in Earth's magnetic field is continuing." Finlay is the lead author of a new study published in the journal Physics of the Earth and Planetary Interiors that analyzes data from the Swarm satellites.