NASA has abandoned plans to save the Swift gamma-ray burst observatory, allowing the aging spacecraft to descend toward Earth and burn up in the atmosphere within months.

The decision came after a rescue mission failed to boost Swift to a higher, stable orbit. Launched in 2004, Swift has spent two decades detecting gamma-ray bursts, the universe's most violent explosions. The spacecraft's altitude has steadily decayed as atmospheric drag pulls it downward.

Earlier this year, NASA attempted to use a specially equipped cargo spacecraft to push Swift higher and extend its life. The boost operation did not achieve sufficient altitude gain, leaving the agency without viable options to prevent reentry. Swift's fuel reserves are depleted, eliminating the possibility of using onboard thrusters for a final push.

The observatory's demise marks the end of a remarkably productive mission. Swift detected gravitational wave counterparts from neutron star collisions, solved decades-old mysteries about gamma-ray burst origins, and provided early warnings that allowed other telescopes to capture observations of some of the universe's most extreme events. The spacecraft's rapid-response capabilities made it invaluable for time-sensitive astronomy.

NASA estimates Swift will reenter between March and June 2025. The agency expects most of the spacecraft to burn during atmospheric entry, though some larger components may survive and impact unpopulated ocean regions. The probability of debris hitting a person is extremely low, roughly one in several million.

The decision reflects the challenges of space sustainability. Swift's long operational life has made it a victim of its own success. Modern satellites increasingly include propulsion systems or are designed for controlled deorbiting, preventing scenarios where functioning spacecraft become uncontrollable hazards.

Other gamma-ray observatories, including Fermi and INTEGRAL, will continue monitoring the high-energy universe after Swift's retirement. However, astronomers will lose Swift's unique speed and precision