NASA’s 22-year-old Swift Observatory is expected to fall back to Earth after a robotic spacecraft failed to raise its declining orbit, ending a mission that detected thousands of cosmic explosions and contributed to nearly 7,000 scientific studies.
By yourNEWS Media Newsroom
NASA’s Neil Gehrels Swift Observatory is nearing an uncontrolled return to Earth’s atmosphere after a $30 million rescue mission failed to save the aging space telescope, bringing an end to more than two decades of scientific observations of gamma-ray bursts, exploding stars and distant black holes.
The U.S. Space Force predicted the approximately 1.5-ton spacecraft would reenter the atmosphere around Friday, Oct. 30, although the precise timing and location remained uncertain Saturday as military tracking systems monitored its declining orbit.
Most of the telescope is expected to burn up during reentry, but some components, including dense tungsten parts and fragments of its mirrors, could survive the descent, according to The Associated Press.
NASA scientists said surviving debris would most likely fall into the ocean. However, portions of Africa, Australia, India, Southeast Asia and Central and South America remain within the possible reentry zone because the spacecraft’s final trajectory cannot be predicted precisely far in advance.
The observatory, launched Nov. 20, 2004, was designed to operate for two years but continued producing scientific data for nearly 22 years.
Its mission officially ended Oct. 20, when the spacecraft descended to approximately 171 miles above Earth and could no longer maintain the stable orientation required for astronomical observations.
In an Oct. 23 announcement, NASA confirmed that the observatory had entered safe mode and that ground controllers at Pennsylvania State University had issued a command effectively ending operations.
The agency attributed the accelerated orbital decline partly to increased solar activity, which caused Earth’s upper atmosphere to expand and exert greater drag on the spacecraft.
All satellites in low Earth orbit experience some atmospheric resistance, gradually losing altitude unless they can periodically raise their orbits.
Swift lacked a propulsion system capable of maintaining its altitude, leaving the observatory increasingly vulnerable as atmospheric drag intensified.
NASA attempted to extend its operational life through an experimental commercial servicing mission involving Katalyst Space Technologies, an Arizona-based company developing robotic spacecraft capable of approaching and servicing satellites already in orbit.
The agency awarded Katalyst a contract worth approximately $30 million in September 2025 to develop and launch a spacecraft called LINK.
The mission was designed to demonstrate whether a privately developed robotic vehicle could capture an existing spacecraft and raise its orbit without requiring modifications to the original satellite.
LINK was equipped with three robotic arms intended to secure Swift and an electric propulsion system designed to push the telescope into a higher, more sustainable orbit.
The rescue spacecraft launched July 3, 2026, aboard a Northrop Grumman Pegasus XL rocket from Kwajalein Atoll in the Pacific Ocean.
However, technical problems developed shortly after launch.
According to NASA’s August announcement ending the rescue attempt, LINK experienced attitude-control problems that prevented the spacecraft from maintaining the stable orientation necessary to approach and capture Swift.
Two of its three reaction wheels, which help control spacecraft orientation, became inoperable. Problems involving its propulsion system further complicated attempts to restore control.
Engineers succeeded in reducing the spacecraft’s uncontrolled rotation, but the recovery efforts consumed resources needed for the planned rescue.
LINK eventually approached within approximately seven to nine miles of Swift and photographed the observatory, but it never came close enough to capture or reposition the telescope.
NASA and Katalyst formally abandoned the orbital boost attempt Aug. 19.
The rescue spacecraft subsequently reentered Earth’s atmosphere in September, ending the experimental mission without accomplishing its principal objective.
The unsuccessful operation demonstrated the technical challenges associated with servicing satellites that were not originally designed to be captured or refueled in space.
Nevertheless, NASA officials said the effort provided valuable engineering experience for future robotic servicing missions.
“Building, testing, and operating this mission has already strengthened America’s space industry pipeline, advancing in-space servicing capabilities in completely new ways,” Shawn Domagal-Goldman, director of NASA’s Astrophysics Division, said when the rescue attempt was abandoned.
NASA had previously suspended some of Swift’s scientific activities to reduce atmospheric drag and preserve enough orbital altitude for LINK to attempt the rescue.
Once the servicing mission was canceled, engineers restarted the observatory’s scientific instruments.
On Aug. 26, the team resumed operations using Swift’s X-ray Telescope and Ultraviolet/Optical Telescope. Its Burst Alert Telescope subsequently returned to full operation, allowing the observatory to resume automatically repositioning itself toward newly detected cosmic events.
That decision enabled Swift to collect additional scientific observations during its final weeks, although the spacecraft’s movements increased atmospheric drag and accelerated its descent.
NASA reported that the telescope continued observing hundreds of astronomical targets, including remnants of stellar explosions, active supermassive black holes and comets within the solar system.
On Oct. 20, the observatory’s altitude declined to approximately 171 miles, where increased atmospheric resistance prevented it from maintaining the pointing accuracy needed for scientific measurements.
Ground controllers then shut down operations in preparation for reentry.
The mission’s conclusion marks the loss of one of NASA’s principal instruments for detecting gamma-ray bursts, among the most energetic events observed in the universe.
Gamma-ray bursts are brief but exceptionally powerful emissions of high-energy radiation associated with phenomena such as the collapse of massive stars and collisions involving neutron stars.
Some bursts release enormous amounts of energy within seconds and can be detected across billions of light-years.
Swift was designed to identify these events rapidly and redirect its instruments to study their fading emissions in X-ray, ultraviolet and visible wavelengths.
Its automated response capability allowed astronomers to begin observing newly discovered explosions within minutes, providing information about their origins and the physical processes occurring during and after the events.
The observatory also transmitted alerts to other astronomical facilities, including NASA’s Hubble and James Webb space telescopes, enabling coordinated investigations.
Over its operational lifetime, Swift detected more than 2,000 gamma-ray bursts and observed approximately 1,400 supernovas.
Its measurements contributed to research involving distant galaxies, black holes, neutron stars, comets, asteroids and other astronomical objects.
Scientists estimate that data collected by the mission have supported approximately 7,000 scientific publications.
In an assessment of Swift’s scientific legacy, NASA emphasized the telescope’s unusually long operational life and its contributions to understanding some of the universe’s most energetic events.
“Swift delivered an incredible, lasting return on investment for the nation, designed for a two-year primary mission but productive for more than 10 times as long,” Domagal-Goldman said.
The observatory was renamed in 2018 in honor of Neil Gehrels, the NASA astrophysicist who served as its principal investigator until his death in 2017.
The mission involved international cooperation, including contributions from institutions in the United States, United Kingdom and Italy.
Researchers used its instruments to investigate the afterglows of gamma-ray bursts, track the behavior of supermassive black holes and study stars destroyed by extreme gravitational forces.
One of Swift’s scientific achievements came in 2009, when it detected a gamma-ray burst whose light had traveled approximately 13 billion years before reaching Earth, allowing researchers to study conditions in the early universe.
The telescope also helped astronomers identify different types of gamma-ray bursts and distinguish explosions caused by collapsing stars from those associated with collisions between compact astronomical objects.
Its rapid-response capabilities made it especially valuable for identifying transient events that could disappear before other telescopes had time to locate them.
NASA scientists are now examining how existing observatories and future missions might compensate for the loss of Swift’s monitoring capabilities.
Brad Cenko, the mission’s chief scientist, said that although other telescopes can observe gamma-ray bursts, Swift’s combination of instruments and ability to redirect rapidly made it particularly difficult to replace.
The approaching reentry also raises questions about spacecraft disposal and the growing number of satellites operating in low Earth orbit.
Most spacecraft descending from orbit break apart and burn up as they encounter the increasingly dense atmosphere.
However, particularly dense or heat-resistant components can occasionally survive and reach Earth’s surface.
According to Associated Press reporting carried by ClickOnDetroit, mission scientists believe tungsten components and some mirror fragments from Swift could withstand the heat of reentry.
The U.S. Space Force continues tracking the observatory, using orbital measurements to estimate when and where the spacecraft could enter the atmosphere.
The possible debris corridor covers a broad geographical area, but the likelihood of fragments striking populated areas remains low because oceans cover most of Earth’s surface.
Pennsylvania State University astronomer John Nousek, who helped lead Swift’s operations, described the mission’s ending as an inevitable consequence of operating a spacecraft in low Earth orbit.
“We’ve known this day would come since before Swift was launched. At least in low-Earth orbit, what goes up must come down. And that end is catastrophic,” Nousek said.
Although Swift’s instruments have been shut down, the scientific information collected throughout its mission remains available for analysis.
NASA expects researchers to continue using the observatory’s extensive archive to investigate gamma-ray bursts, stellar explosions and other astronomical events long after the spacecraft’s return to Earth.
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