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Space Weekly Review 2026-04-23
Week In Review
This was a week of milestones both triumphant and troubled in the launch industry. Blue Origin achieved a historic first by reusing a New Glenn booster, only for the mission to falter when its upper stage delivered a customer satellite to the wrong orbit, prompting an FAA grounding. SpaceX, by contrast, continued its drumbeat of operational maturity by logging its 600th Falcon booster landing and launching the final GPS III satellite for the Space Force—even as the Pentagon terminated the $6.27 billion ground control system meant to run the constellation.
Observatories old and new dominated the science side of the week. NASA unveiled the completed Roman Space Telescope ahead of its September launch, JWST detected water-ice clouds on a nearby super-Jupiter, and DESI completed the largest 3D map of the universe by cataloguing 47 million galaxies across 11 billion years of cosmic history. Meanwhile, ALMA revealed that interstellar comet 3I/ATLAS carries 30 times more deuterated water than any solar system comet, offering a direct chemical fingerprint from another planetary system. Rounding out the week, Rocket Lab delivered eight JAXA satellites including a deployable origami-folded antenna—a reminder that the broadening international launch ecosystem continues to accelerate technology demonstration.
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NASA Unveils Completed Roman Space Telescope, Targets September Launch
NASA invited media to Goddard Space Flight Center on April 21 for one of the final opportunities to view the fully assembled Nancy Grace Roman Space Telescope before it ships to Kennedy Space Center for launch preparation. The multibillion-dollar flagship observatory has completed construction and is wrapping up prelaunch testing, with NASA Administrator Jared Isaacman announcing an early September 2026 launch target—well ahead of the agency's no-later-than commitment of May 2027.
Roman will carry a 2.4-meter primary mirror—the same size as Hubble's—but its Wide Field Instrument will capture images with a field of view 100 times larger than Hubble's. As Isaacman put it, "What would take Hubble 2,000 years to process, Roman can do in a year." The telescope's primary science goals include probing dark energy by surveying how the universe's expansion has changed over time, conducting a census of exoplanets using gravitational microlensing, and imaging nearby planetary systems with a coronagraph technology demonstrator.
The unveiling marks a major milestone for a project that has been in development since 2010. Roman is expected to work in concert with JWST, combining the latter's deep infrared sensitivity with Roman's sweeping survey capability to create the most comprehensive picture yet of the universe's structure, contents, and evolution.
Source: NASA
Blue Origin Reuses New Glenn Booster for the First Time
Blue Origin launched its New Glenn rocket from Cape Canaveral Space Force Station on April 19, marking the vehicle's third flight and the first time a previously flown New Glenn first stage returned to service. The booster separated roughly 3.5 minutes into flight and successfully landed on Blue Origin's droneship "Jacklyn" in the Atlantic Ocean, demonstrating that New Glenn's reusability architecture can function as designed.
The successful booster recovery represents a pivotal step in Blue Origin's effort to close the gap with SpaceX's Falcon 9, which achieved its 600th booster landing just one day earlier. Reusability is essential to New Glenn's business case, as the heavy-lift rocket is intended to compete for national security, commercial, and eventually human spaceflight missions. The landing validated the booster's thermal protection system and landing systems after their first exposure to the stresses of a prior flight.
However, the celebration was short-lived. The mission's upper stage encountered a problem during its second engine burn, delivering the AST SpaceMobile BlueBird 7 communications satellite to the wrong orbit—a setback that overshadowed the booster milestone and triggered regulatory scrutiny.
Source: Space.com
FAA Grounds New Glenn After Payload Delivered to Wrong Orbit
The Federal Aviation Administration grounded Blue Origin's New Glenn rocket on April 20, one day after the vehicle's third flight failed to deliver its payload to the correct orbit. The FAA classified the event as a "mishap" and opened a formal investigation, stating that return to flight depends on determining the root cause and implementing corrective actions to protect public safety.
Early data suggest the problem originated during the upper stage's second burn, when one of the two BE-3U engines did not produce sufficient thrust to reach the target orbit. AST SpaceMobile confirmed that its BlueBird 7 satellite, designed to provide direct-to-cellphone broadband service, was rendered unusable in the lower-than-planned orbit and was expected to reenter the atmosphere and burn up. The loss represents a significant setback for AST SpaceMobile's constellation deployment timeline.
The grounding adds regulatory uncertainty to New Glenn's nascent launch manifest at a critical moment for Blue Origin. The company holds contracts for national security missions and is pursuing commercial customers in a market dominated by SpaceX. How quickly Blue Origin resolves the investigation and returns New Glenn to flight will be closely watched as a measure of the company's operational maturity.
Source: TechCrunch
SpaceX Achieves 600th Falcon Booster Landing
SpaceX completed its 600th successful Falcon first-stage landing on April 18 during a Starlink mission from Vandenberg Space Force Base. Booster B1097, flying for the eighth time, delivered 25 Starlink satellites to low Earth orbit before touching down on the droneship "Of Course I Still Love You" in the Pacific Ocean—an event that has become so routine it barely registers as news, which is itself the point.
The milestone captures the cumulative impact of a reusability program that began with SpaceX's first successful Falcon 9 landing in December 2015. In the decade since, booster recovery has transformed from a seemingly impossible stunt into the economic backbone of the commercial launch industry. SpaceX now routinely flies individual boosters ten or more times, dramatically reducing per-launch costs and enabling a launch cadence that no competitor has matched.
The 600th landing arrived just one day before Blue Origin demonstrated its own reuse capability with New Glenn, underscoring the widening competitive landscape in reusable heavy-lift launch. For SpaceX, the number serves less as a celebration than as evidence that the company's focus has shifted to Starship—the fully reusable super-heavy vehicle intended to make even Falcon 9 look incremental.
Source: Space.com
SpaceX Launches Final GPS III Satellite for the Space Force
A SpaceX Falcon 9 rocket lofted the tenth and final GPS III satellite into medium Earth orbit on April 21, completing a constellation upgrade that has been underway since 2018. The satellite, GPS III Space Vehicle 10, launched from Cape Canaveral aboard booster B1095 on its seventh flight, with the first stage landing successfully on the droneship "Just Read the Instructions."
The GPS III satellites deliver three times greater accuracy and up to eight times improved anti-jamming capability compared to the previous generation. Completing the ten-satellite block ensures that the upgraded signals—including the civilian L1C signal compatible with Europe's Galileo system—will be available globally as older satellites are phased out. The final launch comes at a consequential moment, arriving just days after the Space Force terminated the troubled OCX ground control system that was supposed to manage the constellation.
With the GPS III block now complete, attention shifts to the next phase: GPS IIIF, a follow-on series that will incorporate additional resilience features and a digital navigation payload. The ground segment question remains open, however, as the Pentagon pivots to upgrading the existing Lockheed Martin Architecture Evolution Plan system rather than fielding the canceled OCX.
Source: Spaceflight Now
Space Force Terminates $6.27 Billion GPS Ground Control Program
The U.S. Space Force announced on April 17 that it was canceling the GPS Next Generation Operational Control System, known as OCX, after determining the program "was unable to deliver needed capabilities on an operationally relevant timeline at an acceptable level of risk." The decision ends one of the Defense Department's most troubled acquisition programs, which had consumed $6.27 billion—nearly double its original $3.7 billion estimate—while missing its original 2016 delivery date by a decade.
The OCX system, developed by RTX (formerly Raytheon), was intended to provide a modern ground control architecture for the GPS III satellite constellation, including the ability to fully exploit the satellites' anti-jamming and civil signal capabilities. Years of software integration challenges, cybersecurity requirements, and schedule slips made the program a cautionary tale in space acquisition circles. The Space Force cited "insurmountable" challenges in its termination rationale.
In place of OCX, the Pentagon will pursue upgrades to the existing ground system through Lockheed Martin's Architecture Evolution Plan, which recently received a $105 million contract. While AEP can control current GPS satellites and the forthcoming GPS IIIF series, it remains to be seen whether the incremental approach can unlock the full modernization features that OCX was designed to enable—leaving a gap between the constellation's hardware capabilities and the ground system that commands it.
Source: Breaking Defense
Rocket Lab Deploys Eight JAXA Satellites on "Kakushin Rising" Mission
Rocket Lab's Electron rocket launched eight satellites for the Japan Aerospace Exploration Agency on April 22 from Launch Complex 1 in New Zealand. The mission, named "Kakushin Rising," was the second of two contracted Electron flights for JAXA's Innovative Satellite Technology Demonstration Program and marked Rocket Lab's 87th launch overall and eighth of 2026.
The most eye-catching payload was a satellite carrying a deployable antenna built using origami-folding techniques that allow it to pack tightly for launch and then unfurl to 25 times its stowed size once in orbit. The remaining payloads included educational smallsats, an ocean-monitoring satellite, and a demonstration unit for ultra-small multispectral cameras—collectively representing JAXA's strategy of using small, low-cost missions to flight-test technologies before committing them to larger programs.
The mission also highlights Rocket Lab's growing role as a dedicated small-launch provider for government space agencies beyond the United States. With rideshare slots on larger rockets becoming cheaper, Rocket Lab's competitive advantage lies in offering dedicated orbits on a customer's timeline—a value proposition that JAXA's multi-satellite technology demonstration program is well suited to exploit.
Source: Space.com
JWST Detects Water-Ice Clouds on Nearby Super-Jupiter
A team led by Elisabeth Matthews at the Max Planck Institute for Astronomy used the James Webb Space Telescope to directly image Epsilon Indi Ab, a super-Jupiter located just 11.8 light-years from Earth, and found evidence of thick, patchy water-ice clouds in its atmosphere. The results, published in the Astrophysical Journal Letters, challenge existing atmospheric models that typically neglect cloud formation in giant exoplanets.
Epsilon Indi Ab has a mass of approximately 7.6 Jupiters but a diameter similar to Jupiter's, making it one of the closest and best-characterized giant exoplanets. Using JWST's Mid-Infrared Instrument, the team detected less ammonia than atmospheric models predicted—a deficit best explained by the presence of high-altitude water-ice clouds analogous to cirrus clouds on Earth. Co-author James Mang noted that "what once seemed impossible to detect is now within reach, allowing us to probe the structure of these atmospheres, including the presence of clouds."
The discovery underscores how JWST's sensitivity is exposing the limitations of cloud-free atmospheric models that have dominated exoplanet science for decades. As direct imaging of cold giant planets becomes routine, the community will need to invest in computationally expensive cloudy models to accurately interpret the data—a challenge, but one that promises a far richer understanding of planetary atmospheres beyond our solar system.
Source: Max Planck Institute for Astronomy
DESI Completes Largest 3D Map of the Universe with 47 Million Galaxies
The Dark Energy Spectroscopic Instrument completed its originally planned five-year survey, having catalogued more than 47 million galaxies and quasars—far surpassing the 34 million target—from the NSF Nicholas U. Mayall 4-meter Telescope at Kitt Peak National Observatory in Arizona. The resulting 3D map spans 11 billion years of cosmic history and represents the most detailed large-scale survey of the universe ever assembled.
By tracing how galaxies clustered at different epochs, DESI has provided the most precise measurements yet of how dark energy has influenced the universe's expansion. Early results using three years of data hinted that dark energy, long assumed to be a "cosmological constant," might be evolving over time—a finding that, if confirmed by the full dataset, would represent a fundamental revision of the standard cosmological model.
DESI will continue observations through 2028, expanding its survey area by roughly 20 percent and aiming for a total of 63 million extragalactic redshifts. The extended campaign will provide the statistical power needed to determine whether the hints of evolving dark energy hold up—potentially reshaping our understanding of the universe's ultimate fate.
Source: Berkeley Lab
ALMA Reveals Interstellar Comet 3I/ATLAS Formed in a Far Colder World
The Atacama Large Millimeter/submillimeter Array made the first-ever measurement of deuterated water in an interstellar object, finding that comet 3I/ATLAS contains over 30 times more semi-heavy water (HDO) than is found in Earth's oceans and 30 times more than in any solar system comet. The results, published in Nature Astronomy, indicate the comet formed in an extremely cold environment—below 30 Kelvin—vastly different from the conditions that shaped our own planetary system.
The observations were led by PhD student Luis E. Salazar Manzano at the University of Michigan and obtained with ALMA's Atacama Compact Array just six days after 3I/ATLAS reached perihelion. 3I/ATLAS is only the third confirmed interstellar object to pass through our solar system, following 1I/'Oumuamua and 2I/Borisov, but the first for which a detailed isotopic water signature has been obtained—offering a direct chemical fingerprint from another star's planetary system.
The elevated deuterium-to-hydrogen ratio serves as a cosmic thermometer, revealing that the comet's birthplace was subjected to far lower temperatures and less radiation than the protosolar nebula. This measurement transforms 3I/ATLAS from a curiosity into a laboratory for comparative planetary science, providing ground truth about the chemical diversity of planet-forming environments across the galaxy.
Source: ALMA Observatory