Space Weekly Review 2026-09-12

Week In Review

The week’s most consequential launch carried almost nothing. Isar Aerospace’s Spectrum rocket lifted six small satellites and a technology experiment from a spaceport inside the Arctic Circle, and in doing so became the first vehicle to reach orbit from continental Europe. Europe has launched from French Guiana for sixty years; it has never before closed the loop at home. The same broadening of the supplier base showed up twice more on the American side: NASA added Relativity Space’s Terran R to the contract vehicle that governs its science launches, and the European Space Agency signed with the startup Vast to put the first Greek citizen in orbit on a commercial station-visiting mission. None of these three is a finished capability. All three are institutions committing money and schedule to companies that did not exist a generation ago.

The science results this week came from instruments operating near the floor of what is detectable. MeerKAT pulled a hydrogen radio signal out of the distant universe directly rather than by stacking known galaxies, which is the step that turns hydrogen intensity mapping from a proposal into a survey technique. Webb and Hubble, working the same targets in tandem, found 27 icy bodies beyond Neptune small enough that no ground-based telescope could have seen them — and then found fewer of them than models predicted, which is the more interesting half of the result. ALMA measured the chemistry of the interstellar comet 3I/ATLAS and found it unlike anything born around our own Sun. And BepiColombo’s Finnish-built particle detector recorded a solar eruption driving charged particles straight through Mercury’s magnetosphere and onto the ground, a measurement that doubles as a stress test for what a severe storm would do to Earth’s own magnetic shield.

Running underneath both stories is a third: the slow, unglamorous work of building things that will not operate for years. The US Space Force settled on a Texas lake bed as the last of three sites for a radar network it expects to switch on in 2030. NASA finished bolting four refurbished Space Shuttle engines into the core stage of the rocket meant to return humans to the lunar surface. And the agency spent a modest sum asking a small company whether a reentry vehicle could be used to demonstrate aerocapture — braking into orbit on a planet’s atmosphere rather than on rocket fuel — a technique that has been on paper since the 1980s and has never been flown. The distance between a $350,000 study contract and a Uranus orbiter is enormous. It is also how every item on this list started.

Items

Europe Finally Reaches Orbit From Europe

Isar Aerospace’s Spectrum rocket lifted off from Andøya Spaceport in northern Norway on 5 September and reached orbit, making the German company the first to complete an orbital launch from continental Europe. Europe has had an independent launch capability since the 1970s, but it has always been exercised from Kourou in French Guiana, on the northeast coast of South America. A working pad on the continent itself changes the geometry of the European launch business — Andøya sits at high latitude with clear northward range, which suits the polar and sun-synchronous orbits that most Earth-observation and small-satellite customers want.

Spectrum is a modest vehicle by the standards of the American heavy-lift market: roughly 28 meters tall and 2 meters in diameter, with ten engines across two stages, designed to place up to 1,000 kilograms into low Earth orbit. That is the small-launch class — not a competitor to Falcon 9 on cost per kilogram, but a direct route to orbit for payloads that would otherwise wait months for a slot on a rideshare mission and then be dropped in someone else’s preferred orbit.

This was Spectrum’s second flight. The payload reflected that status: six commercial and educational CubeSats plus an in-orbit technology demonstration, a manifest chosen so that a failure would have cost customers relatively little. Reaching orbit on flight two is a genuinely good record for a new privately developed launcher, most of which need three or more attempts.

The flight also matters institutionally. Isar is one of the companies competing in the European Launcher Challenge, ESA’s attempt to seed a competitive commercial launch sector rather than continuing to fund a single national champion. Demonstrating an orbital flight is the gating requirement of that program, and Isar has now cleared it first. Whether the company converts that into a sustainable cadence is a separate question — small-launch history is littered with firms that reached orbit once and then ran out of money — but the technical milestone is real and it is European.

Source: Space.com

A Radio Whisper From Nine Billion Years Ago

Astronomers from the University of Manchester and the University of the Western Cape, using South Africa’s MeerKAT array, have directly detected the faint radio emission of neutral hydrogen gas at distances of roughly 3.67 and 4.76 billion light-years — light that left when the universe was about 10 and 9 billion years old. The results were published in The Astrophysical Journal Letters.

Neutral hydrogen radiates at a wavelength of 21 centimeters, a signal produced by a rare quantum flip in the hydrogen atom. It is the most abundant atom in the universe and the raw material of every galaxy, which makes it an ideal tracer of cosmic structure. The problem is that the signal is extraordinarily weak, and at cosmological distances it is buried under radio emission from our own galaxy and from human transmitters that can be many thousands of times stronger.

The technique the team used is called hydrogen intensity mapping, and it sidesteps the sensitivity problem by giving up on resolving individual galaxies. Instead of cataloguing objects one at a time, it measures the total hydrogen brightness across large patches of sky and tracks how that brightness varies from place to place. The measurements here trace hydrogen across scales of several million light-years — roughly the distance from the Milky Way to Andromeda — which is the scale on which the cosmic web of filaments and voids is organized.

What makes this a milestone is the word directly. Previous intensity-mapping results largely relied on cross-correlating the radio data with optical galaxy surveys, using the known positions of galaxies to dig the hydrogen signal out of the noise. A direct detection means the radio data alone carries enough information, which in turn means the method can survey volumes of sky where no optical catalog exists.

If it scales — and the team expects it to, with wider sky coverage and longer integrations — intensity mapping becomes a fast way to map enormous cosmic volumes. That has direct bearing on measuring how dark matter shapes large-scale structure and how the expansion of the universe has changed over time, questions where the current tension between different measurement methods has resisted resolution for a decade.

Source: University of Manchester

Twenty-Seven Frozen Worlds, and Not Enough of Them

For the first time, astronomers combined Hubble and the James Webb Space Telescope on the same distant targets: the trans-Neptunian objects, the population of icy bodies orbiting beyond Neptune that constitute the solar system’s least-disturbed archive. Two complementary papers published this week in The Astronomical Journal report 27 newly discovered TNOs, along with analysis of their colors, composition, and size distribution.

The faintness involved is hard to overstate. NASA’s description of the dimmest object detected is that spotting it is equivalent to standing on Earth and seeing a small swarm of fireflies on the Moon. The smallest body observed is about five kilometers across — roughly five times smaller than the limit of what the most sensitive ground-based telescopes can reach. Hubble and Webb contributed different strengths: the pairing allowed the teams both to find these objects and to characterize what they are made of.

The headline result is a shortfall. The teams found fewer small TNOs than models of the outer solar system predicted. Collisional-evolution models generally forecast a steeply rising number of objects as you go down in size, because collisions grind big bodies into many small ones. Fewer small objects than expected means either that the grinding has been less efficient than assumed, or that small bodies are destroyed or removed faster than the models allow.

The second result is about color, and it is the reason NASA framed the finding as these objects “remembering” their past. The newly found small TNOs follow the same color-versus-orbit relationships that their much larger cousins do. Color in this context is a proxy for surface chemistry — how much of the original organic-rich ice has been processed by radiation and heat. That the small bodies track the large ones suggests they retain a compositional signature tied to where they originally formed, rather than having been thoroughly scrambled by billions of years of collisions and migration.

Taken together, the two results tighten the constraints on how the outer solar system was assembled. The TNO population is the debris left over from planet formation, and the shape of its size distribution and the pattern of its surface chemistry are among the few direct records we have of conditions in the disk 4.5 billion years ago.

Source: NASA Science

Watching the Sun Bombard Mercury’s Surface

Newly reported results from BepiColombo’s SIXS instrument describe what happened when a solar eruption struck Mercury while the spacecraft was flying just 165 kilometers above the surface during its fourth Mercury flyby in September 2024. Electrons and protons accelerated by the eruption penetrated the planet’s magnetic field and rained down across a broad area of the surface.

Mercury has a magnetic field, but a weak one, and its magnetosphere is far smaller than Earth’s relative to the planet it protects. Under ordinary conditions it still deflects most of the solar wind. Under the pressure of a solar eruption it gets compressed to the point where energetic particles reach the ground directly. SIXS — a combined X-ray and particle detector designed and built in Finland, with the University of Turku’s Rami Vainio as co-principal investigator of the particle side — was in exactly the right place to watch it happen from close range.

The particle bombardment is not merely a hazard to be catalogued; it is a scientific instrument in its own right. Incoming particles knock material off Mercury’s surface and stimulate the surface to fluoresce in X-rays. Both effects encode composition. Measuring the particle flux going in and the X-rays coming out lets researchers work backward to what the surface is made of and how space weathering has altered it over billions of years — a key question for a planet with no atmosphere to shield it.

There is a terrestrial payoff as well. The conditions SIXS recorded at Mercury resemble what would happen at Earth if an extreme solar storm compressed our own magnetosphere severely enough. Those events are rare and we have limited direct measurements of them, so a naturally occurring analog observed up close is useful for estimating how deeply destructive radiation could penetrate Earth’s near-space environment during the most powerful storms.

The measurements come as the mission enters its main phase. BepiColombo’s two orbiters separated from their transfer module in early September; orbit insertion at Mercury is scheduled for November, with the ESA and JAXA orbiters separating from each other in December to begin their distinct campaigns — one focused on the surface and interior, the other on the magnetosphere that SIXS just watched fail.

Source: Phys.org

An Interstellar Comet Made of Something Else

Observations of 3I/ATLAS with the Atacama Large Millimeter/submillimeter Array, published this week, find the interstellar comet carries an extraordinary amount of methanol. Measured against hydrogen cyanide — a standard reference molecule for cometary chemistry — the methanol ratios come in at roughly 70 and 120, placing 3I/ATLAS among the most methanol-rich comets ever measured, including all the ones that formed around our own Sun.

3I/ATLAS is only the third confirmed interstellar object to pass through the solar system, and each one has been a single-sample experiment in comparative planetary science. A comet’s ice composition is set by the temperature and radiation environment where it condensed. Measuring that composition on an object ejected from another star is the closest thing available to a direct chemical sample of a different planetary system’s formation zone. A methanol abundance this far outside the solar system’s range implies the ice either formed under conditions unlike those in our protoplanetary disk, or was subsequently processed by radiation in a way our comets were not.

The observations were taken with ALMA’s Atacama Compact Array on several dates in late 2025, as the comet fell toward the Sun and its ices began to sublimate. The compact array trades angular resolution for sensitivity to extended emission, which turned out to matter for what the team found.

The more unusual result concerns where the methanol comes from. In an ordinary comet, gas streams off the solid nucleus. In 3I/ATLAS, methanol is released both from the nucleus and from millions of tiny icy grains suspended in the surrounding coma, each grain acting as its own small evaporating source. Astronomers have suspected this kind of distributed outgassing in solar system comets; this is the first time it has been tracked in an interstellar object.

That matters for interpretation as much as for chemistry. If a meaningful fraction of the gas is coming from grains rather than the nucleus, then abundance measurements that assume a single central source can be systematically wrong. Separating the two contributions — as this work does — is what makes the comparison with solar system comets meaningful rather than an artifact of the model.

Source: Space.com

NASA Adds a Rocket That Hasn’t Flown Yet

NASA announced on 9 September that it has added Relativity Space’s Terran R to its Launch Services II contract, making the Long Beach, California company eligible to bid on the agency’s future science and exploration missions. The addition came through NLS II’s annual on-ramp provision, a mechanism that lets NASA bring new providers into the pool as their vehicles mature rather than freezing the roster for the life of the contract.

NLS II is not itself an award of any specific launch. It is a multiple-award, indefinite-delivery/indefinite-quantity contract — a qualification framework with an ordering period running through June 2030 and an overall period of performance through December 2032. Being on it means a company has satisfied NASA that its vehicle is credible enough to compete; actual missions are then competed among the qualified providers task order by task order.

For NASA, the value is straightforward. The agency’s science launches have for several years depended heavily on a small number of providers, and concentration is a scheduling risk as much as a pricing one — a single vehicle stand-down can ripple through years of mission manifests. Terran R is a partially reusable medium-to-heavy lifter aimed squarely at the class of missions NASA flies most often.

For Relativity, the on-ramp is a credential earned in advance of a first flight. Terran R has not yet launched. Qualifying for NLS II does not change that, and the company still has to demonstrate the vehicle before it can win and fly a task order. But being inside the contract when the vehicle debuts means it can compete immediately rather than waiting for the next annual on-ramp cycle — a difference that can be worth a year or more of manifest position.

Source: NASA

A Texas Lake Bed Completes a Three-Nation Deep Space Radar

The US Space Force has selected Lake Kickapoo, Texas — about 120 miles northwest of Fort Worth — as the site for the third and final node of the Deep Space Advanced Radar Capability, a surveillance network operated jointly with the United Kingdom and Australia. Construction is expected to begin in 2027 following contract award and the required approvals, with civil construction complete in 2029 and operations beginning in 2030. Northrop Grumman holds the DARC contract.

The problem DARC addresses is geometric. Geostationary orbit sits about 36,000 kilometers up, where satellites hold station over a fixed point on the equator — the orbit used for communications, weather, and a good deal of national security infrastructure. Tracking objects at that distance has historically depended on optical telescopes, which means clear skies and darkness. A large fraction of the time, operators simply cannot see what is there.

Radar solves that by supplying its own illumination. DARC is designed to provide continuous, all-weather, day-and-night coverage of geostationary orbit, and the three-site geography is what makes “continuous” achievable: sites in the United States, the United Kingdom, and Australia give overlapping coverage as the Earth rotates, so no object drifts out of view.

There is a certain continuity in the location. Lake Kickapoo previously hosted the main transmitter for the AN/FPS-133 Space Fence, the continuous-wave radar that tracked low Earth orbit for decades before it was retired. The site was chosen then for the same reasons it works now: remote, flat, and radio-quiet.

Whether this counts as space infrastructure or defense infrastructure is partly a question of framing. Geostationary orbit is a crowded shared resource, and knowing reliably what is in it — including debris and drifting dead satellites — is a prerequisite for operating there safely regardless of who owns the tracking system.

Source: Breaking Defense

Greece Signs Up Its First Astronaut

The European Space Agency signed an agreement with Vast on 9 September, at the International Space Summit in Paris, to fly Dr. Adrianos Golemis to the International Space Station — the first Greek citizen to reach orbit. Golemis, an ESA flight surgeon, will serve as mission specialist on what Vast describes as the sixth private astronaut mission to the ISS, conducted in partnership with NASA.

The mission is targeted for no earlier than summer 2027, launching on a SpaceX Falcon 9 and Crew Dragon from Florida for a stay of roughly two weeks. Golemis would fly alongside ESA astronaut Thomas Pesquet of France as commander and ESA project astronaut Aleš Svoboda of the Czech Republic as pilot. The crew assignment is subject to approval by the Multilateral Crew Operations Panel, the international body that signs off on everyone who boards the station. Training begins this month in the United States with Vast, SpaceX, and NASA.

The arrangement reflects a structural shift in how smaller European states access human spaceflight. Rather than waiting for a national astronaut to work through a long ESA rotation for a six-month station increment, a country can contract for a short-duration flight with a defined research program. ESA has now done this on behalf of the Czech Republic and Greece within a few months of each other, acting as the contracting intermediary rather than the flight provider.

For Vast, the agreement is commercially significant in a way that goes beyond one seat. The company is building the Haven series of commercial stations and is competing for a role in whatever succeeds the ISS after its planned retirement. Private astronaut missions to the ISS are the proving ground for that ambition — they demonstrate crew operations, government customer relationships, and the ability to hold a schedule, all of which are things NASA will weigh when it commits to commercial destinations. A signed agreement with a national space agency is a more durable credential than a memorandum of understanding.

Source: Vast

Four Shuttle Engines Go Into the Artemis III Core Stage

Teams at Kennedy Space Center have completed installation of all four RS-25 engines on the core stage of the Space Launch System rocket assigned to Artemis III, the mission intended to land astronauts near the lunar south pole. The four engines together will produce more than two million pounds of thrust at liftoff, working alongside the vehicle’s two solid rocket boosters.

The RS-25 is a genuinely old design flying new hardware. It was developed as the Space Shuttle Main Engine in the 1970s, and the engines on this core stage are refurbished units with flight history from the Shuttle program, modified for the higher throttle setting and the expendable, one-flight-only role SLS demands. It remains one of the most efficient large rocket engines ever built, which is why NASA kept it — and it is also, unavoidably, an engine designed to be reused that is now being thrown away after a single flight.

Engine installation is a specific kind of milestone. It is not a test and it does not validate anything new; it is the point at which the core stage stops being a set of components and becomes an integrated vehicle element ready for stacking. Work on Artemis III has been proceeding in parallel with Artemis II, the crewed lunar flyby that precedes it, and the same reporting notes that analysis has confirmed the trajectory fix applied to Artemis II’s Orion spacecraft.

Artemis III is currently scheduled for 2027, and the landing itself depends on hardware outside NASA’s direct control — principally the crewed lander derived from SpaceX’s Starship, which has its own development curve. But the transportation stack that gets astronauts from Earth to lunar orbit and back is measurably closer to complete than it was a week ago, and the engines that will do it have now been bolted in place.

Source: NASASpaceFlight.com

NASA Buys a Study of Braking on Air

NASA has awarded Inversion Space a $350,000 contract to study how the company’s Arc reentry vehicle could be used to demonstrate aerocapture — using a planet’s atmosphere, rather than rocket propellant, to slow a spacecraft into orbit. The study, announced 10 September, covers mission design, aerodynamics, trajectory analysis, and vehicle definition, and runs through 30 June 2027.

Aerocapture is a well-understood idea that has never been flown. A spacecraft arriving at a planet on a hyperbolic trajectory must shed enormous velocity to be captured into orbit, and conventionally that means carrying the propellant to do it — propellant that must itself be launched from Earth, and which can dominate the arriving spacecraft’s mass. Aerocapture instead threads the vehicle through the upper atmosphere on a single pass, letting drag remove the excess energy, then fires a small burn to raise the orbit clear of the atmosphere. It is distinct from aerobraking, which uses many gentle passes over months and is routine; aerocapture does it once, at full speed, with no second chance.

That single-pass character is exactly why it has not flown. The corridor is narrow: too shallow and the spacecraft skips off into solar orbit, too steep and it burns up or lands. Threading it requires accurate atmospheric models, precise navigation, and active guidance during the pass — a combination nobody has been willing to risk on a flagship mission arriving at a planet after a decade in transit.

The payoff is largest exactly where missions are hardest. For the ice giants — Uranus and Neptune, both prioritized in recent planetary science planning — the propellant needed for conventional orbit insertion is a major constraint on how much science instrumentation can be carried and how quickly the spacecraft can be sent. Aerocapture could convert a flyby-class budget into an orbiter-class mission, or cut years off the cruise by permitting a faster arrival.

Inversion’s angle is that it already builds an atmospheric-entry vehicle. Arc is a lifting-body reentry spacecraft designed to return cargo from orbit, which means the company has been working on the guidance and thermal protection that aerocapture requires, for a different reason. Demonstrating the maneuver at Earth — where the atmosphere is well-characterized and a failed attempt costs a small vehicle rather than an interplanetary mission — is the cheapest possible way to retire the risk. The contract funds a paper study, not a flight. But every flown technique started as one.

Source: Payload