Swift re-enters over northern Sumatra after 22 years
NASA’s Swift observatory re-entered over northern Sumatra on 4 November, ending nearly 22 years in orbit. Designed for a two-year mission, the telescope followed thousands of cosmic explosions. Its descent followed a failed commercial servicing attempt intended to lift its orbit; the rescue spacecraft had already re-entered in September. Its final science observation took place in October.
Science··Morning
Re-entry over Indonesia
NASA’s Neil Gehrels Swift Observatory re-entered Earth’s atmosphere over northern Sumatra, Indonesia, on 4 November. The roughly 1,450 kilogram spacecraft had spent nearly 22 years in orbit. Astronomer Jonathan McDowell reported the location using US Space Force data. Its return had previously been forecast for that day; the new information identifies the region where atmospheric entry actually occurred. Swift’s final scientific observation had taken place on 20 October, before the spacecraft’s physical departure from orbit.[1], [2]
A servicing mission failed to reach Swift
Swift carried no thrusters to counter atmospheric drag and raise its own orbit. As the observatory descended, drag accelerated its fall. In September 2025, NASA awarded spacecraft-servicing company Katalyst Space a 30 million dollar contract to send a robotic vehicle to the telescope. The plan called for that vehicle to meet Swift and boost it into a higher orbit, extending the observatory’s working life rather than replacing its scientific instruments.[1]
Katalyst launched its LINK servicing spacecraft on 3 July, aiming for an August rendezvous. The three-armed vehicle developed propulsion and reaction-wheel problems; reaction wheels help a spacecraft maintain its orientation. Those faults prevented the planned meeting. LINK itself re-entered on 25 September. NASA described the attempt as a high-risk servicing mission, and Swift continued toward atmospheric return after the rescue effort ended.[1]
Thousands of cosmic explosions observed
Launched in November 2004 for a two-year primary mission, Swift observed more than 2,000 gamma-ray bursts and 1,400 supernovas. Gamma-ray bursts are extremely powerful cosmic explosions whose fading light demands rapid observation. Swift could locate a burst, alert other observatories and turn its telescopes toward it in about a minute. Its programme also included black holes, asteroids and comets. In 2018, the observatory received the name of its first principal investigator, Neil Gehrels, who had died the previous year. NASA said the observatory’s rapid response helped other telescopes coordinate observations before the burst afterglows faded.[1]
