分类: science

  • What can scientists learn from a stray SpaceX rocket hitting the Moon?

    What can scientists learn from a stray SpaceX rocket hitting the Moon?

    In an unplanned cosmic collision that has turned into a rare scientific windfall, a discarded upper stage of a SpaceX Falcon 9 rocket has impacted the Moon’s surface near the iconic Einstein crater, opening new doors for lunar research that will benefit future human and robotic missions to Earth’s only natural satellite.

    The crash occurred at approximately 06:35 GMT on Wednesday, with the empty 4,000-kilogram rocket stage – roughly the size of a five-story building – striking the lunar surface at a blistering speed of nearly 8,700 kilometers per hour. The brief, intense flash generated by the impact was all but invisible to even the most well-equipped amateur astronomers, lasting just a fraction of a second and appearing far too faint for ground-based telescopes to capture clearly. While amateur observers were unlikely to spot the flash, some may have detected a plume of ejected lunar dust stretching as far as 100 kilometers that lingered for several minutes after the collision.

    No orbiting spacecraft were positioned to capture the impact in real time. South Korea’s Danuri lunar orbiter passed the crash site shortly before the collision, and the mission team has confirmed that any collected data and imagery will not be released to the public until initial scientific analysis is complete. In the coming days, NASA’s long-operating Lunar Reconnaissance Orbiter will maneuver into position to photograph the impact site, allowing scientists to compare high-resolution pre- and post-impact imagery to map the newly formed crater in detail.

    The path to this accidental collision began more than 18 months ago, when the Falcon 9 rocket launched from Cape Canaveral, Florida, in January of the previous year. Its core mission was to deliver two robotic lunar landers onto a trans-lunar trajectory out of Earth’s orbit, a goal the rocket completed successfully. After deploying its payload, the spent upper stage was left drifting in a large, looping orbit that alternated between swinging close to the Moon and returning near Earth. Over the following year and a half, tiny, cumulative gravitational tugs from the Earth, Moon, and Sun, combined with the faint pressure of solar radiation, gradually shifted the rocket stage’s orbit until astronomers tracking the debris confirmed it was on an irreversible collision course with the Moon, gaining speed with each passing orbit.

    Initial observations and early data analysis are being led by large ground-based observatories across the Americas, where the sky was still dark at the time of impact. Even for these advanced facilities, detecting and processing clear data of a 14-meter object striking the Moon 385,000 kilometers from Earth is a significant challenge, and scientists warn it could take days or even weeks to produce a full, clear picture of the impact site and the initial findings from the event.

    For planetary geologists and lunar scientists, this unplanned collision is far more than an interesting space oddity – it is a unique, well-characterized natural experiment. Unlike most random impact events, researchers already have precise data on the rocket stage’s mass, size, speed, and exact impact location, allowing them to test long-standing models of crater formation, debris dispersion, and seismic activity within the Moon’s interior. These data will have direct practical applications for future lunar exploration: understanding how far impact debris travels and how much seismic shaking is generated by high-speed collisions will help engineers design safer lunar landers and durable long-term Moon bases for crewed missions.

    Additionally, the material ejected from beneath the Moon’s surface during the impact will provide new, unaltered samples of lunar geology that can be studied remotely, helping scientists refine existing theories about the formation of the Earth-Moon system 4.5 billion years ago.

    This event marks far from the first time a human-made object has collided with the Moon. Since the Soviet Union’s Luna 2 probe became the first human-made object to impact the lunar surface in 1959, dozens of spacecraft and rocket stages have crashed there, both intentionally for scientific research and by accident. Notable past impacts include NASA’s Ranger probes in the 1960s, discarded rocket stages from the Apollo program, and the 2009 LCROSS mission, which was deliberately crashed into a polar crater to confirm the presence of water ice. The last confirmed accidental rocket impact occurred in 2022, when a discarded booster from a 2014 Chinese lunar mission struck the lunar surface, highlighting the growing issue of orbital space debris that has been accumulating around Earth and the Moon for more than 60 years.

  • SpaceX rocket stage expected to slam into Moon

    SpaceX rocket stage expected to slam into Moon

    An unplanned collision between the discarded upper stage of a SpaceX Falcon 9 rocket and the lunar surface is set to take place this week, an event that carries no risk to life or infrastructure on Earth but promises to deliver valuable new insights for lunar research. The 4,000-kilogram booster section, left adrift in space after launching a mission carrying two lunar landers in January 2022, is on track to strike the Moon’s northern hemisphere near the iconic Einstein Crater at roughly 06:35 GMT on Wednesday, hurtling toward the surface at 8,690 kilometers per hour. Once impact occurs, researchers expect a bright, sunlit plume of dust, rubble and ejecta to burst outward from the crash site — a phenomenon that both professional scientists and amateur astronomers around the world are being encouraged to observe and document. Benjamin Fernando, a researcher at Los Alamos National Laboratory in New Mexico and lead author of a recent pre-print paper analyzing the upcoming impact, notes that the brightness of the ejecta plume remains unpredictable, which makes this unplanned event all the more valuable for the research community. “It might be possible for folks with a telescope to observe the plume of ejecta created by the impact,” Fernando told Agence France-Presse. “It is unclear how bright it will be, which is one of the reasons why we are looking to study this event.” The crash will leave a new, permanent crater on the lunar surface, and NASA has confirmed it will track the rocket body through its final approach for training purposes, then study the impact site after the collision to advance scientific understanding of lunar dynamics. In an official statement, NASA spokesperson Jimi Russell emphasized, “There is no danger to Earth.” SpaceX’s director of NASA Science and Dragon Programs, Julianna Scheiman, explained at a Monday press briefing that standard protocol is followed for all high-energy deep space missions to dispose of second stages in compliance with global space regulations. “We did that,” Scheiman said, confirming that the planned disposal maneuver was executed correctly. However, “what has happened is essentially a mixture of solar activity and gravity forces have put it on a path towards the Moon.” Like many researchers and space enthusiasts, Scheiman added that she is eager to see observations of the rare event. The research team behind the pre-print paper notes that the unplanned impact offers a rare chance to test core systems for future lunar exploration. The event will help scientists refine their methods for locating impact craters on the lunar surface, which will support upcoming planned lunar seismic experiments. It also offers an unmatched opportunity to study how dust and ejecta behave during high-velocity impact events on the Moon, and to improve assessments of the hazard artificial space debris poses to future lunar infrastructure. With NASA targeting the late 2020s to establish a long-term sustained human presence on the Moon through its Artemis program, understanding the distribution and behavior of artificial debris in lunar orbit has become a critical priority for space agencies worldwide. While the Moon is constantly impacted by natural space debris such as meteoroids, collisions with large artificial objects are far less common. The last major intentional artificial impacts were carried out by NASA decades ago during the Apollo program, when the space agency deliberately crashed mission stages into the Moon to collect seismic data from the Apollo seismometers left on the surface. Unlike those planned tests, this unplanned event gives the modern research community a chance to study an impact with current observational technology, filling gaps in knowledge that will support the next generation of lunar exploration.

  • What will happen when a SpaceX rocket collides with the Moon?

    What will happen when a SpaceX rocket collides with the Moon?

    For millions of years, Earth’s only natural satellite has endured a constant barrage of interstellar impacts. Asteroids and meteors have carved its iconic pockmarked landscape, leaving a sprawling network of craters that tell the story of our solar system’s violent history. In modern decades, human space exploration has added a new type of impact to the Moon’s surface, from intentional probe crashes to accidental collisions from discarded launch hardware. On August 5, the Moon is set to receive yet another human-made visitor: an abandoned upper stage of a SpaceX Falcon 9 rocket, drifting through space at 2.43 kilometers per second (roughly 5,400 miles per hour), is on track to collide with the lunar surface.

    The prediction of this upcoming crash comes from NASA’s Center for Near-Earth Object Studies (CNEOS), which confirmed the trajectory after independent astronomers used public launch data to identify the rogue rocket component. The discarded stage was left in orbit following a January 2025 joint U.S.-Japanese lunar mission, which carried two lunar landers and a suite of scientific instruments to lunar orbit. While SpaceX designs most Falcon 9 components to be reusable and return to Earth for future flights, upper stages are often jettisoned in space after completing their boost mission, left to drift in orbit until gravitational forces pull them toward a collision with a celestial body.

    Weighing in at no less than 4,000 kilograms (8,800 pounds) on Earth and roughly the size of a five-story building, this piece of space hardware is set to impact near the historic Einstein Crater, a location on the Moon’s Earth-facing side that will be bathed in daylight at the time of collision. Astronomer Bill Gray, the researcher who first identified the object’s collision trajectory, estimates the impact will carve a new crater more than 17 meters (56 feet) in diameter into the lunar surface. The collision is scheduled to occur at approximately 02:35 EDT (06:35 GMT) on August 5.

    NASA has stressed that the incoming rocket stage poses zero risk to populations or infrastructure on Earth. In a statement, agency spokesperson Jimi Russell noted that NASA will continue tracking the booster as a training exercise for near-Earth object monitoring, and will later study the fresh impact site to advance lunar science.

    The unplanned collision has drawn excitement from both amateur and professional astronomers around the world, who see it as a rare, free research opportunity that would be impossible to arrange intentionally. Dr. Matt Bothwell, public astronomer at the University of Cambridge, explained that the event will be far more dramatic than any similar impact on Earth, thanks to the Moon’s lack of atmosphere and much weaker gravitational pull. With no atmospheric drag to slow the incoming rocket, the entire 4,000-kilogram mass will hit the surface at full speed, throwing up an enormous plume of lunar dust that could reach 50 kilometers or higher into space, before spreading across the surrounding terrain. An estimated one million kilograms of rock and dust debris will be launched into space following the impact, a spectacle that cannot be replicated in controlled experiments on Earth.

    While the impact flash will not be visible to the naked eye from Earth, observers with access to high-powered professional or advanced amateur telescopes may be able to spot a brief flash of light on the lunar surface immediately after collision. A broad international collaborative effort is already in place to capture as much data as possible from the event: large ground-based telescopes across the Americas will monitor the impact, NASA’s Lunar Reconnaissance Orbiter and South Korea’s Danuri lunar probe will capture close-up observations of the flash, dust plume and newly formed crater, and a citizen science project is recruiting amateur astronomy enthusiasts to record the event as well.

    By observing the plume in real time and mapping the new crater after impact, researchers hope to turn this accidental collision into a groundbreaking scientific experiment. Tracking the volume of ejected material, the height of the plume, and how dust falls back to the surface will allow scientists to refine existing models of lunar impact processes. The crash will also expose fresh, unaltered subsurface material at the impact site, giving researchers a rare unplanned look at the composition of lunar rock just below the surface that has never been exposed to space weathering.

    Beyond the scientific gains, astronomers say the event also serves as a stark reminder of the growing problem of human-made space debris. “I think more people should be more worried about space debris,” Bothwell noted. “Every single year we put more stuff in orbit. Sometimes the satellites just collide, and they shatter into more pieces. I think there’s a worry about a runaway cascade, if we put so much stuff in orbit.” Data from the European Space Agency (ESA) underscores this concern: there are currently more than 54,000 human-made objects larger than 10 centimeters drifting in Earth and lunar orbit, and humans have launched a total of roughly 17,000 tonnes of hardware into space since the start of the Space Age in 1957.

    This is not the first time discarded human rocket hardware has impacted the Moon. The most recent prior incident occurred in 2022, when an upper stage of China’s Long March 3C rocket, left over from the 2014 Chang’e 5-T1 mission, crashed into the Moon’s far side, which is permanently turned away from Earth. Decades ago, NASA intentionally crashed multiple objects into the lunar surface to collect test data ahead of the historic Apollo crewed missions, demonstrating that even unplanned or intentional impacts can advance our understanding of Earth’s closest celestial neighbor.

  • August’s total solar eclipse will sweep over Spain, Iceland and Greenland

    August’s total solar eclipse will sweep over Spain, Iceland and Greenland

    After more than a century without a total solar eclipse crossing its mainland, Spain is poised to welcome a breathtaking celestial event on August 12, capped by an even longer dramatic astronomical showcase next summer. To amplify the spectacle, the once-in-a-generation eclipse will coincide with two other extraordinary sky phenomena: a six-planet alignment and the peak of the annual Perseid meteor shower, creating a rare triple treat for stargazers across the Northern Hemisphere.

    When the sun, moon, and Earth fall into perfect straight-line alignment on August 12, daytime darkness will descend across parts of the Iberian Peninsula, Greenland, and Iceland near the hour of sunset. The moon’s dark, sun-blocking shadow, called the umbra, will begin its journey near the North Pole and track southward across 8,260 kilometers (5,130 miles) of mostly open Atlantic Ocean, taking 90 minutes to complete its path. The longest period of totality, clocking in at 2 minutes 18 seconds, will occur off Iceland’s west coast. By the time the umbra reaches coastal Portugal and mainland Spain, where crowds of astronomy enthusiasts are already gathering, totality will narrow to just around one minute before the eclipse concludes in the Mediterranean Sea. This event acts as a preview for an even longer total solar eclipse coming in 2027, which will offer up to six and a half minutes of totality as it crosses from southern Spain through North Africa and into the Middle East.

    While only viewers along the narrow path of totality will get to experience the full, jaw-dropping effect of the total eclipse, hundreds of millions of people across a vastly larger geographic area will be able to view a striking partial eclipse. The partial shadow of the moon will reach as far north as Alaska and Siberia, covering most of Canada, the northern United States, nearly all of Europe, and large swathes of West Africa. The degree of coverage decreases the further a viewer is from the path of totality: Dublin will see 94% of the sun blocked, Oslo will see 83%, Montreal 18%, New York 9%, and just 2% coverage will be visible in Norfolk, Virginia. Astronomers stress that proper eye protection via certified special eclipse glasses is non-negotiable for any viewing of a partial eclipse, even when only a tiny fraction of the sun is visible.

    The celestial magic does not end with the eclipse. Before dawn on August 12, six planets will align into a visible arc stretching across the pre-sky, and after nightfall, the annual Perseid meteor shower will reach its peak under a dark new moon. Forecasters note that bright streaking meteors could even pass through the frame of totality, with bright planets and distant stars visible in the darkened sky during the event.

    Eclipse-chasing enthusiasts from around the world are already planning their viewing spots, and many are chasing extra rare phenomena alongside the main event. Michael Zeiler, a veteran eclipse mapmaker who is attending his 13th total solar eclipse, will be positioned on a cruise ship in a Greenland fjord serving as a guest lecturer. He plans to point a video camera north to capture the northern lights if they appear during totality, calling a large solar outburst that triggers auroras the “icing on the cake” for his experience. Zeiler notes that his excitement stems from chasing these extremely rare celestial events.

    Major scientific organizations from across the globe are also leaning into the moment, planning public watch parties, live broadcasts, and cutting-edge research. The European Space Agency (ESA) will host a public celebration in Leon, Spain, and stream live coverage from the Astrophysical Observatory of Javalambre, with NASA, the Italy-based Virtual Telescope Project, and other groups also offering global live coverage. ESA Science Director Carole Mundell emphasized that the eclipse is more than just a scientific event or an astronomical alignment: it is a shared human experience that connects all people to the broader cosmos. Two of ESA’s space telescopes will observe the eclipsed sun and its faint outer atmosphere, the corona. While the agency’s Proba-3 mission — a pair of satellites that create artificial solar eclipses for research — will be in the wrong orbital position to observe the natural eclipse from Earth, it will attempt to capture before-and-after imagery of the sun for comparison.

    U.S. university research teams supported by NASA are also conducting atmospheric studies, launching more than 60 high-altitude balloons from sites in Spain and Iceland to measure changes in Earth’s atmosphere during the brief period of cooling and darkness caused by the eclipse. Project lead Angela Des Jardins of Montana State University noted that even just a few minutes of totality is enough to cause measurable atmospheric changes from the moon’s cold shadow. On a NASA high-altitude research plane, Southwest Research Institute scientist Amir Caspi will chase the eclipse’s shadow at 740 kph (460 mph), extending the total eclipse observation time to nearly three minutes for his team. Four specialized cameras will capture the corona across nine different wavelengths, with Caspi expecting to collect thousands of high-quality scientific images during the 180 seconds of extended observation. Even though the natural eclipse is short, Caspi emphasized that the data gathered will be incredibly valuable for solar research.

    For astronomy fans in Spain, this event is just the first of a rare run of celestial shows. In 2027, an exceptionally long total solar eclipse will cross the southern tip of Spain on August 2, offering up to 6 minutes 23 seconds of totality before tracking across Morocco, Algeria, Libya, Egypt, Saudi Arabia, Yemen, and Somalia. Then in January 2028, an annular “ring of fire” eclipse will complete a unique three-eclipse sequence for the country, what ESA’s Mundell calls a “lucky coincidence.”

    This rarity of this week’s event makes it all the more special: mainland Spain’s last full total solar eclipse occurred in 1912, just two days before the sinking of the Titanic. That 1912 event was a rare hybrid eclipse that shifted between annular and total, offering only a few seconds of totality for most of the mainland, leading many astronomers to date the last major total eclipse to 1905. For Andrei Zhukov of the Royal Observatory of Belgium, who has led more than 60 simulated artificial total eclipses as part of the Proba-3 mission over the past two years, any eclipse — natural or artificial — is a cause for excitement. “We’re looking forward to more eclipses, natural or artificial,” Zhukov said.

    This report was produced by The Associated Press Health and Science Department, which receives educational funding from the Howard Hughes Medical Institute Department of Science Education and the Robert Wood Johnson Foundation. The AP retains full editorial control over all content.

  • Ancient mummy DNA provides scientific evidence that colonization brought smallpox to the Americas

    Ancient mummy DNA provides scientific evidence that colonization brought smallpox to the Americas

    For centuries, historical accounts have documented the catastrophic impact of smallpox on Indigenous populations across the Americas after European contact, but concrete genetic proof linking the virus’s arrival to colonization has remained elusive. Now, groundbreaking analysis of ancient DNA extracted from mummified remains recovered in northern Chile has delivered the most definitive scientific evidence to date confirming the deadly virus was introduced to the hemisphere from the Old World via colonial expansion.

    Smallpox ranks among the most devastating infectious diseases in human history. Before its global eradication in 1980, achieved through decades of widespread vaccination campaigns, the virus killed roughly one in every three people it infected, and left most surviving victims with permanent, disfiguring scarring. Repeated outbreaks ravaged populations across Europe and Asia for centuries, before spreading to the Americas in the wake of Columbus’s 1492 voyage. Historical documents from colonial administrators, missionaries and early settlers already record that the virus killed millions of Indigenous people, who had no prior exposure or built-up immunity to the pathogen. But until now, this narrative has lacked solid molecular confirmation.

    The new research, published Thursday in the journal *Science*, was led by a team of international geneticists and anthropologists. Led by Shigeki Nakagome, a geneticist at Trinity College Dublin, the team analyzed 13 ancient bone samples recovered from an archaeological site in Camarones, a region in northern Chile that has preserved numerous well-preserved pre- and post-contact mummified remains. The team’s sequencing uncovered clear fragments of smallpox viral DNA in the leg bones of two individuals: an adult man and an adult woman.

    Radiocarbon dating and genetic analysis placed the deaths of these two individuals between 1492 and 1632, aligning perfectly with the earliest waves of European colonial expansion into South America. When researchers compared the viral genome recovered from the mummies to other known smallpox strains, it fell evolutionarily between medieval European smallpox variants and later New World strains. This phylogenetic placement confirms that the smallpox circulating in South America shortly after contact descended directly from European lineages.

    Patricia Foster, a biologist at Indiana University who was not involved in the new study, noted that while the broad narrative of smallpox’s introduction via colonization has long been accepted, this research provides the hard genetic proof that settles decades of debate. “Nobody would ever question that smallpox came to this hemisphere from colonization, but this proves it,” Foster said.

    While the study confirms the virus originated in the Old World, it leaves open key questions about exactly how it spread to the remote South American site where the mummies were found. The research team notes that it remains unclear which specific group of colonizers or traders first brought the virus across the Atlantic. It could have been carried by early European settlers exploring the South American coast, or spread indirectly via transatlantic slave trade routes that passed through Africa before reaching the Americas.

    Notably, the Camarones site where the remains were found has no surviving historical records of early smallpox outbreaks, raising new questions about how the virus traveled so far south so quickly. The research team hypothesizes the virus may have spread along long-established Indigenous trade networks that connected communities across the Americas long before the first European settlers arrived, allowing it to reach remote inland and southern populations much faster than previously thought.

    Beyond confirming the origin of the virus, the study also offers new insights into how smallpox evolved over time to become more deadly. Comparing the ancient strain to later variants shows the virus gradually silenced specific genes that allowed it to become more efficient at infecting and killing human hosts.

    The research also puts a human face on the catastrophic demographic collapse that followed colonization. Both of the individuals found to carry smallpox were between 18 and 35 years old, and the disease was almost certainly the cause of their deaths. Constanza de la Fuente Castro, study coauthor and biological anthropologist at the University of Chile, emphasized the findings underscore how the devastation of smallpox reshaped the Americas, wiping out entire Indigenous communities and leaving surviving populations vulnerable to European conquest.

    “This wasn’t just a cultural or demographic shift,” de la Fuente Castro said. “It’s literally written into biological evidence that we can still recover and read today.”

  • New dinosaur discovered in Zimbabwe

    New dinosaur discovered in Zimbabwe

    Paleontologists have uncovered a previously unknown dinosaur species on the shores of Zimbabwe’s Lake Kariba, offering groundbreaking new insight into the early diversification of dinosaurs across southern Africa some 210 million years ago. Dubbed *Musango matusadonaensis*, this new find marks only the fifth distinct dinosaur species ever formally named and documented from Zimbabwe, shining a long-overdue spotlight on a region vastly understudied compared to fossil-rich sites in Europe and North America.

    The specimen dates back to the Late Triassic period, a critical evolutionary era when dinosaurs were first expanding their range across the globe, millions of years before they rose to become Earth’s dominant terrestrial vertebrates in the Jurassic and Cretaceous periods. At the time of *Musango*’s existence, modern-day Zimbabwe sat within the massive supercontinent Gondwana, a landmass that also incorporated what is now South America, India, Australia and Antarctica.

    This international research effort, a collaborative project between teams from the United Kingdom, South Africa and Zimbabwe, has yielded a fossil assemblage including key bones from the dinosaur’s spine, forelimbs and feet. Analysis of these remains confirms the individual was nearly fully grown at the time of its death, at approximately eight years of age, measuring 4.5 meters in length — roughly the size of a medium passenger vehicle.

    *Musango matusadonaensis* is classified as a sauropodomorph, an early ancestral relative of the massive long-necked sauropods that would later evolve, such as *Diplodocus*. Unlike its four-legged descendants, this early species walked on two legs. Researchers also concluded it was an omnivore, feeding on a mixed diet of plants and meat that likely included crocodile-like phytosaurs, lungfish and smaller contemporary dinosaur species.

    Lead study author Professor Paul Barrett of London’s Natural History Museum, whose findings are published in the *Journal of Systematic Palaeontology*, noted that long-standing scientific consensus assumed dinosaur communities across southern Africa were largely homogeneous. “However, these discoveries are showing that this part of the ancient supercontinent Gondwana was actually made of a series of smaller ecosystems — each with a different cast of characters,” Barrett explained. This new find adds crucial data to the sparse fossil record of Late Triassic African dinosaurs, helping paleontologists piece together a more accurate picture of how early dinosaur communities diversified and spread across the globe.

  • Meet the astronomer digging into the Milky Way’s ‘fossils’

    Meet the astronomer digging into the Milky Way’s ‘fossils’

    For decades, Argentine-born astronomer Amina Helmi has dedicated her career to unearthing the hidden origins of the Milky Way, treating ancient stars as cosmic time capsules that hold the keys to our galaxy’s chaotic birth. Now, her groundbreaking work rewriting long-held theories of galactic formation has earned her one of the highest honors in the field: the prestigious Kavli Prize, often referred to as the Nobel Prize of astrophysics.

    At 55, Helmi is a professor at the University of Groningen in the northern Netherlands, where her passion for the Milky Way is impossible to miss in her compact office. Family snapshots and towering stacks of dense, jargon-heavy academic dissertations share space with a bowl overflowing with Milky Way chocolate bars – a playful, sweet nod to the star system that has consumed her professional life.

    Helmi is a pioneer in galactic archaeology, a specialized subfield that treats stars as “cosmic fossils” to reconstruct the Milky Way’s ancient history and project its long-term trajectory. Unlike the popular image of astronomers hunched over telescopes scanning the night sky, Helmi’s work centers on parsing enormous astronomical datasets, some of which contain more than two billion lines of stellar data.

    “Stars carry chemical fingerprints that act just like DNA,” Helmi explained in an exclusive interview with AFP. “These chemical compositions preserve irreplaceable information about where a star formed and what environment it originated in, letting us trace billions of years of galactic history.”

    A transformative turning point for Helmi’s research came from the European Space Agency’s Gaia mission, an ambitious project to map the Milky Way in three dimensions, to which Helmi herself contributed. “Gaia measured the motion of nearly 1.5 billion stars across a far larger volume of space than any previous mission,” she noted. “It wasn’t just the sheer number of stars we were able to track – it was the unprecedented accuracy of those motion measurements that changed everything for our field.”

    Armed with Gaia’s unprecedented dataset, Helmi and her collaborators pieced together a cataclysmic event that reshaped the Milky Way forever some 10 billion years ago – hundreds of millions of years before our own Sun formed. At that time, a small dwarf galaxy named Gaia-Enceladus collided and merged with the young proto-Milky Way. The leftover stars from the crashed dwarf now form the diffuse halo that wraps around our galaxy, and the collision triggered a wave of new star formation that created the Milky Way’s signature “puffed up” galactic disk.

    This discovery upended the long-standing scientific consensus that the Milky Way formed through slow, steady, continuous growth. Instead, Helmi’s work confirmed that our galaxy assembled itself incrementally through a series of violent collisions and mergers with smaller cosmic bodies, a process called hierarchical accretion.

    Helmi shares the 2024 Kavli Prize in Astrophysics with two fellow researchers: Vasily Belokurov of the University of Cambridge and Rodrigo Ibata of the University of Strasbourg. The three scientists will split the $1 million prize fund, receive a gold medal, and be honored at a formal ceremony hosted by the Norwegian Academy of Science and Letters in Oslo this coming September. The award committee recognized the trio for “uncovering the fossil evidence of past mergers proving that the Milky Way galaxy was built through hierarchical accretion.”

    Helmi told AFP she was completely stunned when she received the news of the award. “I was totally speechless. To me, this is the biggest honor there is in our field – it’s just absolutely unbelievable,” she said. “This is also wonderful recognition for galactic archaeology as a whole. It’s a relatively young field, but it’s exploded in growth over the last decade, and this award puts that work on the map.”

    Looking ahead, Helmi plans to continue diving into new data releases from the Gaia mission, while developing more robust statistical models to process the field’s increasingly massive datasets. When asked what the Milky Way’s violent youth means for its future, she offered a reassuring take: “Nothing major has happened to our galaxy since that early collision. You could say it had a wild, turbulent youth, and now it’s enjoying a quiet, restful adulthood.”

  • How to watch Australia’s spectacular ‘buck moon’ light up the night sky

    How to watch Australia’s spectacular ‘buck moon’ light up the night sky

    Astronomy enthusiasts across Australia are gearing up for a rare celestial treat this week, as a distinctive full buck moon — classified as a micro moon that will outshine two active meteor showers — prepares to light up southern hemisphere skies this Thursday.

    This July full moon carries unique orbital characteristics that set it apart from other full lunar events in 2024. Unlike supermoons that occur when a full moon aligns with its closest approach to Earth, this full moon coincides nearly with apogee, the farthest point in the moon’s elliptical orbit around our planet. This positioning makes it a micro moon, and it will also reach the second-highest peak in the night sky of any full moon this year, a quirk of its seasonal alignment.

    Visibility timelines vary slightly across Australia’s southern and eastern states, with the micro moon set to become visible from approximately 4:45 pm AEST in Tasmania, the Australian Capital Territory, Victoria and New South Wales. Dr. Laura Driessen, a postdoctoral researcher and science communicator at the Sydney Institute for Astronomy, shared key insights to help stargazers maximize their viewing experience.

    “The moon’s orbit around Earth is not a perfect circle — it’s slightly oval, so the farthest point from our planet is called apogee,” Driessen explained. “This is a full moon that occurs when the moon is at its most distant from Earth, creating the micro moon effect.”

    Driessen noted that the buck moon’s intense brightness will overpower the faint streaks of two meteor showers active this week, making the lunar event the main attraction for skywatchers. For optimal viewing, she recommends that enthusiasts travel away from the bright artificial light pollution of major urban centers to darker, open rural areas. “A clear night sky is the biggest factor for good viewing,” she said. “In Australian winter, the air tends to be drier than in other seasons, which actually works in our favor, creating crisper, clearer viewing conditions.”

    The name “buck moon” has its origins in Indigenous North American naming traditions, coined to mark the time of year when young male deer begin growing new antlers. Though the name originated on the other side of the globe, it has been widely adopted in modern astronomy calendars used by Australian skywatchers. After this week’s event, the next full moon will peak in late August, and it will carry the name Sturgeon Moon, another traditional North American naming convention tied to seasonal fishing patterns.

  • The future of the UK’s renowned Lovell radio telescope is in question after a funding cut

    The future of the UK’s renowned Lovell radio telescope is in question after a funding cut

    LONDON – A landmark decision to end public funding for one of the world’s most historic and celebrated radio telescopes has triggered widespread outrage and deep concern across the global scientific community. The Lovell Telescope, the centerpiece of the Jodrell Bank Observatory – a UNESCO World Heritage Site located in northwest England that has pushed forward the boundaries of cosmic exploration for nearly seven decades – will lose all government backing after 2028, according to an official announcement.

    U.K. Research and Innovation (UKRI), the government’s public funding body for research and innovation, revealed the funding change Monday. The 76-meter-wide Lovell Telescope, a recognizable regional landmark that has stood since the 1950s, is a core component of e-Merlin, a national network of seven interconnected radio telescopes managed by the University of Manchester’s Jodrell Bank Centre for Astrophysics, south of Manchester.

    In its statement, UKRI justified the cut by saying the decision came out of “a rigorous prioritization process to focus investment on the areas that will deliver the greatest long-term scientific capability, impact and value for the U.K.” Public funding for the entire e-Merlin array will cease at the end of March 2028.

    Leading figures from the British and international scientific community have quickly pushed back against the decision, warning that the cuts will cause irreversible damage to the U.K.’s standing in global astronomy research. Renowned particle physicist and broadcaster Brian Cox, based at the University of Manchester, described the funding cut as “devastating and irreversible.”

    Paul Howarth, president of the U.K.’s Institute of Physics, called the latest cuts to physics funding that include Jodrell Bank “a terrible blow to the scientific community.” He has called on newly appointed Prime Minister Andy Burnham to reverse the decision, warning that the choice undermines Britain’s global reputation as a leading destination for scientific research, discovery and innovation.

    “For the sake of U.K. physics and our national reputation as a place to do science, conduct research and innovate, we would urge the new government to review this ruinous set of decisions,” Howarth said.

    The University of Manchester, which oversees operations of the e-Merlin network and the Lovell Telescope, has confirmed it is currently pursuing alternative funding from private businesses, philanthropic organizations, and potential new government grants to save the facility. However, university leaders have made clear that without securing alternative backing, the telescope will cease to operate as an active scientific research instrument after 2028.

    Sarah Sharples, the university’s dean of science and engineering, told reporters: “But, if we don’t find those alternative sources of funding, then there is a risk that as of the end of March 2028, the Lovell Telescope will not be an actively functioning scientific facility for radio astronomy.”

    Completed in 1957, the same year the Soviet Union launched Sputnik, the first artificial satellite to orbit Earth, the Lovell Telescope has cemented its place as a trailblazer in global radio astronomy, a field that studies distant cosmic objects through the radio waves they emit. The telescope made history within months of opening by tracking the path of Sputnik as it orbited the planet, a feat that put Jodrell Bank on the global map. In the decades that followed, it received the first transmitted images from the lunar surface in 1966 during the early era of space exploration, and has enabled groundbreaking discoveries of distant galaxies, while advancing scientific understanding of black holes, quasars, pulsars and gravitational lenses.

    During the Cold War, the telescope also served a critical national security role, operating as an early-warning system to detect incoming Soviet intercontinental ballistic missiles. The site’s public engagement center, which welcomes thousands of visitors and school groups annually to learn about astronomy and space science, will not be impacted by the funding cuts.

  • Gunther von Hagens, the German anatomist behind the ‘Body Worlds’ exhibition, dies at 81

    Gunther von Hagens, the German anatomist behind the ‘Body Worlds’ exhibition, dies at 81

    Legendary German anatomist Gunther von Hagens, the polarizing innovator whose traveling ‘Body Worlds’ exhibits of plastinated human bodies sparked global fascination, fierce ethical debate and shifted public understanding of human anatomy, has passed away at the age of 81. His family and the Institute for Plastination, the research organization he founded, confirmed that von Hagens died on Friday, with no additional details about his death provided in the official statement released Monday. The anatomist had publicly disclosed a Parkinson’s disease diagnosis in 2010, having lived with the condition for more than a decade.

    At the core of von Hagens’ decades-long career was his revolutionary development of the plastination technique, a preservation method he began refining in the 1970s. The process replaces natural bodily fluids with curable liquid plastic that hardens over time, stopping tissue decomposition while preserving the full structure of organs and cells. This breakthrough allowed von Hagens to create lifelike, durable displays of human bodies that brought internal anatomy out of medical school laboratories and into public view.

    The first ‘Body Worlds’ exhibition launched in Japan in 1995, marking the start of a global cultural phenomenon. Two years later, the show opened in von Hagens’ native Germany, overcoming fierce opposition from religious leaders who tried to block the exhibit on the grounds that it disrespected the human dignity of the deceased. Defending his work, von Hagens emphasized that his goal was not to shock, but to educate the public: by seeing real human anatomy up close, everyday people could better understand how their own bodies function. “I touch here a taboo, which is our body, and nothing is so near as our body is to us,” he once said of his work, arguing that his exhibits forced necessary conversations about long-held cultural taboos surrounding death and the human form.

    All bodies displayed in ‘Body Worlds’ are donated by individuals who explicitly agreed to give their bodies for public education and plastination. Even so, von Hagens faced persistent criticism from religious leaders and medical ethicists who accused him of crossing into sensationalism. Controversial displays — including a plastinated corpse posed riding a horse, and a pregnant donor preserving her eight-month fetus — drew particular condemnation. When the exhibit opened in Berlin in 2001, the Reverend Ernst Pulsfort of Berlin’s Catholic Academy argued von Hagens “plays with the corpses like a child plays with dolls,” claiming the show catered only to public curiosity for shock rather than genuine education.

    Von Hagens doubled down on his unapologetic approach in 2002, when he conducted Britain’s first public autopsy in 170 years during a ‘Body Worlds’ run in London. Wearing his signature black fedora, the anatomist performed the procedure before a sold-out crowd of hundreds, ignoring official government warnings that the act violated public health rules. He called the event a “huge success,” while the head of ethics for the British Medical Association, Dr. Michael Wilkes, condemned it as “degrading and disrespectful.”

    After making its United States debut in Los Angeles in 2004, ‘Body Worlds’ went on to tour dozens of major cities across the country, drawing millions of visitors. In 2006, von Hagens opened the Plastinarium, his purpose-built facility for plastination work, in the eastern German town of Guben.

    Born Gunther Liebchen on January 10, 1945, in what is now western Poland, von Hagens’ early life was shaped by Cold War division. He began medical school in Jena, East Germany, but grew disillusioned with the communist regime and attempted to escape to West Germany. The attempt failed, and he was imprisoned before West Germany purchased his release in 1970, a common practice for political detainees during that era. He resumed his medical studies at the University of Luebeck, and later joined the pathology and anatomy institute at Heidelberg University in the 1970s, where he began his pioneering work on preservation. He adopted the surname von Hagens from his first wife Cornelia, a former classmate, and went on to have three children with her. His second wife, Angelina Whalley, currently leads the Institute for Plastination in Heidelberg and curates the ‘Body Worlds’ exhibitions.

    In accordance with his long-stated wishes, von Hagens’ own body will undergo plastination following his death, the Monday statement confirmed, adding that his family will honor and carry out this request.