NASA launches mission to rescue falling Swift telescope and prevent re-entry into the atmosphere
In operation for more than twenty years, NASA’s Neil Gehrels Swift Observatory is rapidly losing altitude and is at risk of re-entering the Earth’s atmosphere in 2026. Faced with the threat of a premature end to this important mission, the North American space agency is preparing a complex operation: launching a robotic spacecraft to find, capture and push the telescope back to its original orbit. This effort highlights the growing importance of in-orbit servicing technologies to extend the life of valuable space assets.
The Swift telescope was launched in 2004 with the main objective of detecting gamma-ray bursts. These cosmic events are so powerful that they can release, in a few seconds, energy equivalent to the production of the Sun during its entire existence. Throughout its journey, the observatory recorded more than 2,000 explosions and contributed significantly to advancing the understanding of the formation of heavy elements, such as gold and platinum.
Orbital degradation of the Swift telescope
When it was placed in orbit, Swift operated at an altitude of approximately 600 kilometers. As time passed, its trajectory began to progressively degrade. Currently, the telescope is located around 370 kilometers from the Earth’s surface, which represents a considerable drop in its orbital position.
The initial expectation was that the observatory would remain functional until the early 2030s. However, the most recent solar cycle demonstrated a higher intensity than had been predicted. During periods of greatest activity on the Sun, the outer layer of the Earth’s atmosphere heats up and expands, intensifying the drag on satellites and telescopes in low orbit. This phenomenon accelerated the descent of the Swift, a piece of equipment that was never equipped with its own propulsion system, essential for orbital adjustments and elevations.
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Race against time to the rescue
In 2024, the scientists and engineers responsible for the mission realized that the telescope’s situation was much more serious than imagined. The observatory’s projected lifetime was reduced from years to just a few months. In response to the urgency, NASA hired the company Katalyst Space Technologies in September 2025 to develop the robotic rescue spacecraft, named LINK. The design and construction of the vehicle was completed in just seven months, an exceptionally tight deadline for the space sector.
The launch of the LINK spacecraft is scheduled for June 27th, aboard a Pegasus XL rocket. After an initial phase of in-orbit testing, the spacecraft will begin a series of precise maneuvers to get closer to Swift. If the operation is successful, LINK will use its robotic arms to dock with the telescope and gradually raise its orbit over several weeks.
Challenges and risks of the complex space mission
This mission faces considerable challenges, mainly because the Swift telescope was not designed to receive any type of assistance or intervention in orbit. This particularity adds a layer of complexity to both the approach and the capture. Additionally, engineers must consider the possibility of unexpected technical failures, accumulated structural damage due to the observatory’s operating time, and the risk of new solar storms. Such events could further accelerate the telescope’s descent trajectory, making the task even more difficult.
The window for rescue is limited: if Swift reaches an altitude of less than 300 kilometers, the LINK spacecraft will probably not be able to reach it. This condition establishes a race against time as one of the most critical and determining aspects for the success of the entire mission.
Potential shelf life extension and scientific relevance
If the rescue operation is completed successfully, the Swift telescope’s useful life is expected to be extended by another five years. This is crucial, as the observatory is one of the most important instruments for studying extreme cosmic phenomena. “There is no other space telescope with the flexibility needed to observe targets with the same frequency and response time as Swift,” astronomer Daniel Perley told Science magazine. For him, the remarkable relevance of the observatory amply justifies the effort to try to save it.
