NASA Launches Swift Observatory Rescue

A Northrop Grumman Pegasus XL rocket launched the LINK spacecraft on Friday at 4:36 a.m. EDT , putting Link on course to reach and capture NASA's Swift Observatory in about a month . NASA hired startup Katalyst Space Technologies to boost the Swift Observatory to a higher orbit in what will mark the first time a commercial robotic mission has captured an uncrewed NASA spacecraft that wasn't designed to be serviced in space .

Swift has been sinking faster and faster because of recent intense solar activity . NASA says that's happening because solar activity has caused Earth's atmosphere to "puff out," increasing drag on spacecraft in low Earth orbit . Without a boost, it's predicted to plunge to its demise in October .

Why Rescue a 22-Year-Old Telescope?

The $500 million Swift Observatory was launched in November 2004 to study gamma-ray bursts and other high-energy events across the universe . It monitors gamma-ray bursts, detecting about one hundred per year and providing data to other observatories .

Within 20 to 70 seconds of detecting a burst, the observatory can autonomously reorient its entire body and point its X-ray Telescope and Ultraviolet/Optical Telescope directly at the burst's location — faster than any other observatory in existence . That speed makes Swift an irreplaceable alert system for the global astronomy community: dozens of ground-based and space-based telescopes rely on Swift's burst coordinates to trigger follow-up observations in the seconds and minutes after detection. No replacement mission for this capability is currently planned or funded .

NASA's science mission chief Nicky Fox said it's worth the effort. "If we let Swift reenter, we would lose that telescope. We would lose a lot of capability. We don't currently have the budget to build another one to replace that" .

How the Rescue Works

It will take Katalyst's autonomous spacecraft, named Link, about a month to rendezvous with Swift and catch it, and another couple months to raise its orbit from the current 224 miles (360 kilometers) to the desired 373 miles (600 kilometers) .

Link, made by startup Katalyst Space Technologies, is about 880 pounds and five feet tall, with two pinching "fingers" at each end of its three arms . The spacecraft weighs approximately 400 kilograms and stands about 1.5 meters tall. It carries three Hall-effect ion thrusters, 16 reaction-control-system thrusters, two accordion-folding solar arrays, and three robotic arms .

Katalyst Space will spend the next two weeks performing in-orbit checks of the spacecraft, after which Link will begin its approach to Swift and survey the spacecraft, a process expected to take two to three weeks . That survey will include examining Swift and determining the best locations on the spacecraft that Link's three robotic arms can grapple. Project officials said before the launch that while they have identified locations on Swift that they think the arms can grapple, they want to inspect the spacecraft to see if they are still suitable for capture .

After securing Swift in its grasp, LINK will carefully fire its three ion thrusters, aiming to boost the observatory slowly back to its original orbit over the course of two to three months .

Racing the Clock

The 1.6-ton gamma ray observatory must be above 185 miles (300 kilometers) for the rescue to work. It's expected to reach that point of no return in October, according to the latest estimates .

The observatory currently is falling about five miles per month, a descent that will slowly but surely pick up speed as it drops lower and lower into thicker regions of the upper atmosphere . NASA estimates the rescue window closes permanently around October, when Swift will drop below the 186-mile altitude threshold at which atmospheric drag will overpower what LINK's ion engines can deliver .

NASA awarded Katalyst the contract in September 2025, so the company had less than a year to design, build, test, and launch a spacecraft to meet, grab, and lift Swift . "This is a high-risk, high-reward mission," Katalyst Space CEO Ghonhee Lee said ahead of liftoff. "The biggest danger was always we don't launch anything and we let Swift burn up in the atmosphere. So we were always trying to avoid that risk, and our team has done that" .

Final Flight for Pegasus

This is the final flight of the historic Pegasus rocket. An air-launched Northrop Grumman Pegasus XL rocket has flown for the very last time, sending a private spacecraft on a rescue mission to save one of NASA's most iconic space telescopes from falling back to Earth .

The Pegasus XL rocket was released from Northrop Grumman's L-1011 Stargazer jet above the Marshall Islands before igniting its engine and carrying LINK into orbit . The successful launch came after previous attempts were called off due to weather and a software issue affecting the rocket's navigation system .

Katalyst Space selected Pegasus last November because of the unique orbit Swift is in, with an inclination of about 21 degrees. Northrop reportedly offered Katalyst a Pegasus rocket, in storage after being built for another customer, at a low cost .

Over 36 years, Pegasus flew 46 times, launching nearly 100 satellites. At its peak in the 1990s, it flew five to six times annually. Demand declined sharply as rideshare opportunities on larger rockets made dedicated small-lift launchers less economical; between 2016 and 2026, the rocket flew only three times .

What Changed This Week

NASA successfully launched the first commercial mission to rescue a falling government satellite not designed for servicing. The $30 million Swift Observatory rescue mission represents a test case for extending the life of aging space assets through robotic intervention. Katalyst Space Technologies delivered the LINK spacecraft to orbit aboard the final flight of the Pegasus XL rocket, beginning a multi-month operation to capture and reboost the 22-year-old gamma-ray observatory before it falls below the minimum rescue altitude in October.

What to Watch

Link will spend the next two weeks commissioning its systems before beginning its approach to Swift . The capture attempt should occur in early August, followed by a two-to-three-month orbital boost maneuver. If all goes well, Swift could be back scanning the cosmos by September .

A successful Swift reboost could enable similar efforts, including for the Hubble Space Telescope, whose orbit is also decaying and could reenter in the first half of the 2030s. Domagal-Goldman said at an advisory committee meeting in June that he would be open to a Hubble reboost mission, provided the telescope's operating costs can be reduced .

Reporting based on coverage from Space.com, PBS NewsHour, CNN, SpaceNews, Axios, Live Science, NASA, July 3-5, 2026.