An experimental aircraft just achieved a “major milestone” that NASA officials say brings the future of quiet supersonic flight closer to being a reality.
The test flights involved the American space agency’s secretive X-59 aircraft, which reportedly reached speeds of 1.4 Mach—roughly 924 miles per hour—during a flight last Friday.
Reaching an altitude of 55,000 feet, the experimental aircraft’s speed and height during last week’s test flight met the conditions the agency says are required for future flights aiming to achieve supersonic flight without the noisy booms it usually generates.
In a statement, NASA said the aircraft’s tests are far from complete, although Friday’s test marks a significant milestone toward reaching its current mission goals.
“The X-59 still has months of performance testing ahead, but after those are complete, NASA’s Quesst mission will fly the aircraft over several U.S. communities to collect data on public perception of the quiet sonic thump it will make at supersonic speeds,” NASA’s statement on Friday read. “Those community overflights will include flights at Mach 1.4 and 55,000 feet.”
Another Milestone for NASA’s X-59
Last week’s test occurred within days of an earlier takeoff that sent the X-59 on its first successful supersonic flight, where the plane reached a top speed of Mach 1.1.
The earlier test also marked a leap forward for the Quesst mission, which is in the process of completing several crucial steps that are expanding the X-59’s capabilities.
Deployed for test flights at various speeds and at different altitudes, flight engineers are currently gauging the aircraft’s flight envelope by having it perform in a range of different flight conditions.
During its current test flights, NASA said the supersonic aircraft was accompanied by a NASA F-15 research aircraft, which still produces a sonic boom when it flies, unlike the X-59. NASA engineers plan to mount a shock-sensing probe on the accompanying aircraft during future flights, which the agency says will collect vital information about the shock waves the experimental aircraft produces.
The resulting experiments will help engineers measure the exact capabilities of the new aircraft and its supersonic performance.
Additional Prep for NASA’s Quesst Mission
Although designed to function as a “quiet” supersonic aircraft, the X-59 still produces audible signatures, which NASA likens more to being a soft “thump” than a sonic boom.
During its final testing phases, the X-59’s supersonic acoustic signature will also be measured.
If all goes according to plan, the supersonic aircraft will complete its full round of testing in the months ahead, marking a successful series of demonstrations that it meets all the requirements for quiet flight under a range of different altitudes and other flight conditions.
Ultimately, the technologies being innovated by this experimental plane will help to enable the first supersonic flight over land in decades, paving the way toward a new future of commercial flight faster than the speed of sound.
Micah Hanks is the Editor-in-Chief and Co-Founder of The Debrief. A longtime reporter on science, defense, and technology with a focus on space and astronomy, he can be reached atmicah@thedebrief.org. Follow him on X @MicahHanks, and at micahhanks.com.
It’s 2158, and you’re chugging away on your PhD in Planetary Volcanology from the University of Utopia Planitia on Mars. Graduate students still get paid a sub-living wage, so you’ve been stuck eating freeze-dried ramen for the past three years. You’ve completed studying Jupiter’s moon, Io, but now you have to leave the solar system […]
On July 20, 1969, roughly 20 minutes after the lunar module Eagle settled into the dust of the Sea of Tranquility, Buzz Aldrin reached into a small pouch in his personal preference kit, pulled out a thumb-sized plastic vial of wine and a wafer of bread from Webster Presbyterian Church near Houston, and took Communion. And almost no one on Earth heard him do it.
Mission Control had asked him to stay quiet.
The chalice that fit in a glove pocket
The kit was tiny. A plastic film container of wine. A wafer wrapped in cellophane. A miniature silver chalice barely larger than a thimble. A handwritten index card with a verse from the Gospel of John. Aldrin had carried all of it from a small Presbyterian congregation in Webster, Texas, the spiritual home of many of the Apollo astronauts, where he served as an elder, and he described every piece of it afterward in a first-person account for Guideposts.
Neil Armstrong watched without comment. Michael Collins was overhead in Columbia, on the far side of the radio link. The cabin was cramped, the checklist was crowded, and the two men had been awake for the better part of a day.
Why Houston went quiet
The silence on the loop was not accidental. NASA was, at that moment, defending itself against a lawsuit.
On Christmas Eve 1968, the crew of Apollo 8 — Frank Borman, Jim Lovell and Bill Anders — had read the opening verses of Genesis to a live television audience as they orbited the Moon. The broadcast drew a lawsuit from Madalyn Murray O’Hair, the founder of American Atheists, who had already successfully challenged school-sponsored Bible reading and prayer in the United States. O’Hair argued that NASA, a federal agency, had violated the Establishment Clause by allowing its employees to read scripture while on duty. She asked the courts to bar astronauts from religious observance in space.
The reading had also produced the opposite reaction at enormous volume. NASA’s mail rooms filled with letters defending the Genesis broadcast, and the agency found itself caught between a vocal legal challenge on one side and an organized letter-writing campaign on the other. By the summer of 1969 its communications staff had every reason to keep the next mission’s most religiously charged moment off the air.
The suit was pending when Apollo 11 left the pad. Deke Slayton, who ran flight crew operations, pulled Aldrin aside before launch. Slayton’s instruction was practical, and later recounted in detail: go ahead and have your Communion, but keep the comments general. Don’t put us back in court.
So when Aldrin keyed his microphone, what the world heard was a measured, ecumenical request rather than the Christopher Columbus–style planting-of-the-faith ceremony he had originally drafted. He invited listeners to pause for a few moments of silence and to contemplate the events of the past few hours and give thanks in their own way.
Then the loop went quiet. He ate the bread. He drank the wine. He read the verse from John on his own.
O’Hair’s case against NASA was dismissed by a federal court in December 1969, and the Supreme Court later declined to take it up, but its chilling effect on the agency’s communications policy long outlived it. Apollo 11’s most religiously charged moment was therefore conducted in radio silence rather than broadcast — a striking inversion of the Apollo 8 reading that had triggered the whole legal headache.
The wine that crept up the cup
The story of the lunar Communion only filtered into public awareness slowly. Aldrin himself first described it publicly in a 1970 essay for Guideposts magazine, and the details were later expanded in The Guardian’s reconstruction of the ceremony, which drew on Aldrin’s own writings and on the recollections of the Webster congregation. In Aldrin’s telling, the wine behaved strangely — in the one-sixth gravity of the Moon, it curled slowly up the inside of the cup rather than pouring. The Communion elements, he noted, were the first food and drink ever consumed on the lunar surface.
The verse on the card was John 15:5. “I am the vine, you are the branches,” it began, in Aldrin’s own handwriting, the rest of it pressed onto a three-by-five index card he had tucked into the kit on Earth. He read it silently, to himself, in a cabin no one outside could hear.
The chalice that came home
The silver chalice was returned to Webster Presbyterian Church, where it remains. Every July, on the Sunday closest to the anniversary of the landing, the congregation holds a service it calls Lunar Communion Sunday. They play a recording of Aldrin’s radio request. They use the same chalice.
The astronaut who was almost a missionary
Aldrin had originally envisioned something more theatrical. In drafts he later described, the lunar Communion was meant to be broadcast live, a moment of public witness in the tradition of explorers planting crosses on new shores. Slayton’s intervention turned it into something quieter and, in retrospect, stranger: a private sacrament conducted on a world where no sacrament had ever been performed, attended by exactly one celebrant and one silent observer, transmitted to Earth as dead air.
Aldrin himself has been ambivalent about the decision in the decades since. He has written that the Communion was deeply meaningful to him personally, his way of thanking God for the safe descent. He has also written that, looking back, he might not have chosen a Christian sacrament for a mission undertaken “in the name of all mankind.” The Catholic Register’s account of religious experiences among Apollo-era astronauts records that ambivalence at length — the recognition that the crew had been sent not just by the United States but by a planet, and that the planet contained more than one faith.
What survives
Listen to the Apollo 11 air-to-ground record from that part of the timeline and the gap is audible. Aldrin makes his general request. There is a pause. The flight director moves on. The world, leaning toward its televisions and radios, does not know that on the other end of the silence a man is eating a wafer and drinking a sip of wine that is rising slowly up the inside of a thimble-sized cup in a way no liquid had ever risen before.
It was never, strictly, a secret. The press had reported beforehand that Aldrin would carry Communion bread aboard; what NASA withheld was the live broadcast, not the fact. The core elements of the story — the bread, the wine, the chalice from Webster Presbyterian, the radio request, the silence — are confirmed across multiple independent accounts, including Aldrin’s own contemporaneous writings and the church records. The detail that catches people is almost always the wine. It did not pour. It crept.
Aldrin is 96 now. He watched the launch of Artemis II from his home in California on April 1, 2026, on television, with his daughter Jan beside him. Florida Today reported that the Aldrin Family Foundation shared two photographs of him in front of the TV screen as the Space Launch System rocket carried Reid Wiseman, Christina Koch, Victor Glover and Jeremy Hansen on a 10-day flight around the Moon — the first crewed lunar mission since 1972. He is the last surviving member of the Apollo 11 crew.
Aldrin took the sacrament before he stepped out, before Armstrong’s famous descent down the ladder, before the boot print and the flag and the phone call from Richard Nixon. The first human act on the surface of another world, after the engines shut down and the dust settled, was a man eating a wafer of bread that had ridden 240,000 miles in a plastic pouch.
The pouch survives. The chalice survives. The handwritten card survives. The recording of the silence survives. Webster Presbyterian Church will hold its Lunar Communion service again this July, with the same chalice on the same altar, replaying the same audio of a man on the Moon asking the world to give thanks in its own way while NASA — wary of a pending lawsuit — quietly closed the channel and let him eat his bread alone.
Astronomers have made a major breakthrough by directly detecting the gas that fueled star formation in some of the universe’s earliest galaxies. The discovery offers a new way to understand how the first galaxies formed and evolved shortly after the Big Bang. The universe began with the Big Bang about 13.8 billion years ago. Over […]
On the morning of January 16, 1966, readers of Pravda opened the state newspaper to find a name they had never seen in print before: Sergei Pavlovich Korolev. Below it ran an obituary, and a photograph of a broad-faced, heavy-jawed man in a dark suit covered in medals. He had died two days earlier, on January 14, on an operating table at a Moscow hospital, age 59. For nearly a decade, the man who had launched Sputnik, who had put Yuri Gagarin into orbit, who had aimed probes at the Moon and Venus and Mars, had been referred to in Soviet communiqués only as Glavny Konstruktor — the Chief Designer. The world learned who he was after he was already in a coffin.
The secrecy had been deliberate. The Kremlin worried about Western assassination. It also disapproved, officially, of what it called the cult of personalities. So the architect of every Soviet space first remained an unnamed bureaucratic title, even as Khrushchev waved his rockets at the world.
The man behind the title
Korolev was born on January 12, 1907, in Zhitomir, in what is now Ukraine. He trained under the aircraft designer Andrei Tupolev in Moscow, qualified as a pilot, and by 1933 had launched the first liquid-fuelled rocket in the USSR, according to a Guardian profile drawing on James Harford’s biography.
Then, in 1938, secret service agents arrested him as a spy. He was beaten. He confessed, under torture, to crimes of treason and sabotage he had not committed, and was sentenced to ten years’ hard labour at Kolyma, the most notorious of the Gulag camps.
He lost all his teeth there. His jaw was broken. He may have suffered a heart attack. He survived months at the gold mine before being transferred to a prison design bureau in Moscow, where he spent the rest of the war building aircraft and rockets from behind bars.
From Kolyma to the R-7
In 1945, the Red Army made him a colonel and sent him to Germany. The Soviets had seized stores of V-2 components from the Nazis, and they needed someone who could understand them. Wernher von Braun and most of his team had already defected to the Americans with several complete rockets — a head start that would shape the entire Cold War in space.
Korolev studied what was left. He slept a few hours a night. He shouted at engineers and forgave them an hour later. In 1957, he launched the Soviet R-7, the world’s first intercontinental ballistic missile, on a flight from Baikonur to the Kamchatka peninsula. He had beaten the United States to an operational ICBM.
Weeks later, on October 4, 1957, a modified R-7 placed Sputnik 1 in orbit. Korolev had insisted on the satellite being audible — the engineers bolted on transmitters loud enough that ham radio operators around the world could pick up the beep on cheap shortwave receivers, a deliberate choice we’ve written about in the story of Sputnik’s transmitter. The point was for ordinary people to hear it. They did.
The team that built Sputnik, as NPR documented on the satellite’s 50th anniversary, did not fully grasp what they had done. The political shockwave in Washington was larger than anything they had planned for. The Chief Designer kept working.
A name held back on purpose
What followed was the most concentrated run of firsts in the history of spaceflight, all directed by a man whose existence was a state secret. Korolev’s bureau put the first dog in orbit, the first woman, the first multi-person crew. It directed the first spacewalk. It built the first Soviet spy satellite and the first Soviet communications satellite. It flew probes at the Moon, Venus, and Mars — all on a budget that Western analysts would later describe as a shoestring.
Each triumph was announced in the name of Soviet science, the Soviet people, the Soviet system. The man responsible was referred to, when referred to at all, as the Chief Designer. As National Review noted in a 2016 retrospective, the achievement was considered to belong to the collective.
The Kremlin had practical reasons too. A named chief designer was a target. He could be approached by Western intelligence. He could be assassinated. He could be poached. Anonymity was protection, even if it cost him every form of public recognition a scientist could earn.
The morning of April 12, 1961
On the dawn of April 12, 1961, at Baikonur, a peasant farmer’s son named Yuri Gagarin rose on a 20-storey rocket into low Earth orbit. The capsule was small. The pilot was one of the few selected cosmonauts who actually fit inside it.
One orbit. One hundred and eight minutes. Gagarin shouted Poyekhali! — let’s go — and a few minutes later was looking down at clouds and oceans no human eye had ever seen from that altitude. From orbit he radioed back what he saw — the Earth, the clouds, the curve of the horizon — and called the view beautiful.
Gagarin became an instant global celebrity. He toured capitals around the world. The Soviet system had its perfect ambassador, a short, smiling peasant’s son who could disarm hostile crowds in any capital.
Korolev, meanwhile, watched it all from behind the curtain. The cosmonaut he affectionately called his little eagle was a household name on six continents. The man who had designed the rocket, selected the pilot, and directed the mission was, officially, no one.
A body that wouldn’t hold
Five years of relentless work followed Gagarin’s flight. Korolev was already a damaged man — Kolyma had left him with a broken jaw, missing teeth, a weak heart, and what colleagues described as periodic bouts of exhaustion he refused to treat. He slept little. He lived frugally. He carried the entire human spaceflight program in his head and his shouted directives.
In January 1966, he checked into a Moscow hospital for what was meant to be routine surgery. During the procedure, complications arose. Korolev, whose jaw had been broken in the Gulag, could not be properly intubated. His weakened heart failed on the table. He died on January 14, 1966, at the age of 59.
The Politburo decided, this time, that the man should be named.
The Pravda of January 16 carried the announcement. The text identified Sergei Pavlovich Korolev as the academician who had led the design of Sputnik, of Vostok, of Voskhod, of the lunar and planetary probes. His photograph appeared above the fold. For most Soviet citizens, and for everyone outside the USSR, it was the first time they had ever seen his face or read his name in connection with the program.
His ashes were interred in the Kremlin wall, the highest honour the Soviet state could give. He received, in death, the public identity the system had denied him in life. Cosmonauts who had trained under him for years were finally permitted to acknowledge, on the record, who had run their program.
Wernher von Braun, his American counterpart, would learn the name along with the rest of the world. The two men had been racing each other for nearly two decades without von Braun knowing who he was racing.
What the anonymity cost
Some historians argue the secrecy may have cost the Soviet Union the Moon. Korolev had been working on the N-1, a massive lunar rocket meant to carry cosmonauts to the surface, when he died. His successor, Vasily Mishin, was a capable engineer but lacked Korolev’s authority with the political leadership and the rival design bureaus. The N-1 failed in all four of its test launches between 1969 and 1972, each time spectacularly. The program was quietly cancelled.
By then, Armstrong and Aldrin had already walked on the Moon, atop a Saturn V designed by a publicly celebrated Wernher von Braun, who had spent the 1960s on the cover of magazines and as a fixture on American television. Whether a named, internationally lionised Korolev could have held the Soviet lunar program together is one of the great counterfactuals of the space age.
Gagarin, the face the system had built up to the world, did not outlive his mentor by long. He died on March 27, 1968, in a MiG-15 training crash near the village of Novosyolovo, age 34. He had been grounded from spaceflight after the Soyuz 1 disaster killed his friend Vladimir Komarov in 1967 — the state had decided it could not risk its biggest legend. The legend of Gagarin, as Space Daily has reported on the cosmonaut’s enduring grip on Russian memory, only grew after his death.
Both men ended up in the Kremlin wall, urns of ashes set into the brick on Red Square. The peasant’s son who had become the most photographed man in the world, and the engineer whose first photograph in any newspaper was the one printed with his obituary. They lie within a few metres of each other.
The story of how the Soviet system organised its space program — secrets, hidden designers, named cosmonauts, suppressed parachute details, invented Gagarin quotes about not seeing God in orbit — has been the subject of decades of declassification and revision, including museum exhibitions that brought Soviet space artefacts to Western audiences for the first time. Pieces of Korolev’s machines now sit behind glass in cities he was never allowed to visit while alive.
His name today is on a city — Korolyov, just outside Moscow, home to the mission control centre that still flies Russian crews to the International Space Station. It is on craters, on streets, on schools. The Chief Designer has, in the end, become one of the most recognised names in Russian science.
He has been dead for sixty years. He spent fewer than nine of his 59 years as a publicly named man, and all of those nine years he was in prison, in a design bureau, or in a Kolyma mine. The face on the front page of Pravda on January 16, 1966, belonged to someone the world had been watching for a decade without knowing it. The beeps from Sputnik. The voice from Vostok. The probes drifting toward Venus. All of it had a single signature on it, and the signature was a job title.
The world finally learned the name on a winter morning in Moscow, and by then the man it belonged to was already cooling in a hospital room.
In a groundbreaking advancement at the intersection of materials science and advanced manufacturing, researchers Sabroj, Guo, Durygin, and their colleagues have unveiled a comprehensive study that delves deep into the electrical and thermal intricacies of zirconium nitride (ZrN) during flash sintering. Published in npj Advanced Manufacturing in 2026, this combined experimental and numerical investigation sheds new light on the fundamental mechanisms that govern flash sintering processes for this technologically important ceramic. The implications of this research extend far beyond academic interest, promising transformative impacts in industries ranging from electronics to aerospace.
Flash sintering, a revolutionary technique that employs rapid heating under an applied electric field to densify ceramic materials in seconds, has become a focal point in the quest for energy-efficient and time-saving manufacturing methods. Yet, despite its promise, many of the phenomena that occur during flash sintering at the micro- and macroscopic levels remain enigmatic. This study specifically aims to elucidate how zirconium nitride, a refractory ceramic known for exceptional hardness and conductivity, behaves under such extreme, electrically driven conditions.
At the heart of the investigation lies a meticulous synergy between hands-on experimental methodologies and sophisticated numerical modeling. The authors implemented controlled flash sintering experiments whereby ZrN samples were subjected to progressively escalated electric fields, while real-time electrical conductivity and thermal responses were recorded with precision. These experiments provided vital empirical data that exposed nonlinear electrical behavior and transient thermal effects occurring during the rapid sintering process.
Complementing these empirical insights, the team developed a comprehensive numerical model that solved coupled electrical-thermal equations, simulating the interaction between Joule heating and microstructural changes inside the material. This model incorporated temperature-dependent material properties and accounted for the intricate feedback loop where electrical conductivity influences heating rate, which in turn alters conductivity — a hallmark of flash sintering phenomena. This integrated approach allowed the researchers not only to validate their experimental observations but also to predict behaviors outside the range of laboratory testing.
One of the major revelations from this study is the identification of critical thresholds for electrical field intensity and current density that trigger the flash event in ZrN. Below these thresholds, the material shows steady-state electrical conduction with moderate temperature rise. However, upon crossing these critical points, the system experiences an abrupt surge in electrical conductivity concomitant with a rapid increase in internal temperature, effectively accelerating densification in a matter of seconds. This nonlinear transition underscores the delicate balance of electric power input and thermal dissipation necessary to control flash sintering processes.
The thermal behavior of ZrN during flash sintering further reveals compelling dynamics. The researchers observed that thermal gradients within the sample evolve swiftly, generating hotspots that facilitate localized sintering and grain growth. Their numerical simulations illustrated that these thermal nonuniformities are influenced significantly by sample geometry, electrode configuration, and external cooling conditions, emphasizing the multifaceted nature of thermal management in practical manufacturing scenarios.
Moreover, this research goes beyond phenomenology to explore the microstructural consequences of electrical and thermal interactions. Post-sintering analysis indicated that flash sintering induces refined microstructures with enhanced density and improved grain boundary characteristics compared to conventional sintering techniques. Such modifications are critical for tailoring mechanical strength and electrical conductivity, further enhancing ZrN’s suitability for demanding applications.
The study’s findings provide invaluable benchmarks for optimizing flash sintering parameters, enabling manufacturers to fine-tune voltage, current, and heating rates for specific material and product requirements. This unlocks the potential for rapid prototyping and mass production of high-performance ceramic components with reduced energy consumption and environmental footprint. As zirconium nitride is widely applied in wear-resistant coatings, electrical contacts, and cutting tools, the implications are industry-transforming.
Beyond zirconium nitride, the methodological framework established by this study offers a blueprint for investigating other electrically conductive ceramics and composite materials. The marriage of experimental rigor and computational foresight paves the way for a new era of precision-controlled sintering processes. Researchers and engineers can now simulate “what-if” scenarios, preemptively addressing manufacturing challenges and expediting the development cycle for advanced ceramic materials.
The implications for energy efficiency within advanced manufacturing are profound. Traditional sintering methods often require prolonged exposure to high temperatures, consuming vast amounts of energy. Flash sintering, particularly when grounded in an in-depth understanding as provided here, drastically reduces energy and time requirements without compromising material integrity. Such advancements align perfectly with global efforts to reduce industrial energy consumption and carbon emissions.
Electrification of manufacturing processes, as exemplified by flash sintering of ZrN, encapsulates the future trajectory of smart factories and Industry 4.0 paradigms. Integration of real-time monitoring, feedback loops, and simulation-driven control mechanisms as demonstrated in this research can enable autonomous and adaptive manufacturing systems capable of achieving unparalleled precision and efficiency.
This study stands as a testament to interdisciplinary collaboration, blending expertise in ceramic science, electrical engineering, thermal physics, and computational modeling. The researchers navigated complex challenges to build a holistic understanding of flash sintering’s electrical-thermal interplay. Their work lays a cornerstone for continued innovation, inspiring future studies to explore related materials and applications.
In sum, Sabroj, Guo, Durygin, and colleagues have significantly advanced the fundamental science of flash sintering, illuminating the nuanced electrical and thermal behaviors of zirconium nitride. Their integrative approach not only demystifies key mechanisms but also delivers practical insights vital for industrial implementation. As advanced manufacturing strives for smarter, faster, and more sustainable techniques, this research exemplifies how deep scientific inquiry fuels technological leaps — a shining beacon for the next generation of materials engineering.
Subject of Research: Electrical and thermal behaviors of zirconium nitride during flash sintering.
Article Title: Combined experimental and numerical study to understand electrical and thermal behaviors of ZrN flash sintering.
Article References:
Sabroj, R.B., Guo, Z., Durygin, A. et al. Combined experimental and numerical study to understand electrical and thermal behaviors of ZrN flash sintering. npj Adv. Manuf. (2026). https://doi.org/10.1038/s44334-026-00097-6
Tiny traces of material from a giant cosmic explosion are still falling to Earth more than 100 million years after the event occurred, according to a new international study published in Nature Astronomy. The evidence comes from an unusual source: a slow-growing chunk of ferromanganese crust collected from the floor of the Pacific Ocean. Hidden […]
Login
