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One of NASA's great cosmic first responders is coming home the hard way. The Neil Gehrels Swift Observatory, a 1.5-tonne space telescope that has spent 22 years swivelling within seconds toward the universe's biggest explosions, is falling out of orbit after a daring rescue mission failed — and trackers now put its uncontrolled reentry in the first days of November. Most of Swift will burn up in the atmosphere, but NASA warns that a handful of dense parts could survive, most likely falling into the ocean. According to EarthSky and reports based on NASA and US Space Force tracking, the current best estimate centres on Wednesday, November 4, though forecasts still disagree by hours or even days, and the exact time will decide which part of Earth lies beneath it.
Swift launched on November 20, 2004, designed for a two-year mission to study gamma-ray bursts — the most powerful explosions known — along with supernovae and other violent cosmic events. Its superpower was speed: it could pivot rapidly toward a newly detected burst and alert other telescopes, including Hubble and Webb, which would then look deeper. NASA considered it a first responder for the rest of astronomy. Over 22 years it recorded more than 2,000 gamma-ray bursts and 1,400 exploding stars, plus comets, asteroids and stars being shredded by black holes. It outlived its planned lifetime by a decade.
Why it is falling now
Swift orbits low, and intense solar activity over the past few years thickened the upper atmosphere and dragged it down faster than usual. By October 20 it had sunk to about 275 kilometres and entered safe mode, and controllers then ended operations. NASA hired Arizona-based Katalyst Space Technologies about a year ago to mount a rush rescue: a three-armed robotic spacecraft called Link, launched on July 3, was supposed to grab Swift and tow it to a higher, longer-lasting orbit. Link ran into trouble instead — two of its three reaction wheels failed, a bad valve sent it spinning, and although engineers regained control, it never had enough fuel or precision left to do the job. It got no closer than about 12 to 15 kilometres from Swift, and Link itself plunged back to Earth in September. NASA formally called the rescue off on August 19.
After the rescue was abandoned, Swift briefly went back to work, discovering still more gamma-ray bursts. But by late October it was too low to hold steady for observations, and its systems were shut down. There is no engine left to steer it and no way to choose where it comes down.
What survives, and how worried should you be?
Almost everything will not survive. The 1.5-tonne spacecraft is expected to break apart and burn up as it hits denser air, and NASA puts the risk of harm to any person at roughly 1 in 2,100 — low, but not zero, which is why the Space Force keeps tracking it. Mission chief scientist Brad Cenko has said a handful of pieces made of tungsten, a metal denser than lead, along with some mirror parts, could make it through. Because Swift orbits at an inclination of 21 degrees, surviving debris could in principle come down anywhere between 21 degrees north and 21 degrees south — a band covering parts of Africa, northern Australia, India, Southeast Asia and Central and South America, with the ocean the most likely destination for any fragments.
The honest uncertainty is worth stating plainly: different trackers give different centres for the reentry window, from November 4 with roughly half a day of uncertainty to November 6 in some Space Force-based reports, and the window narrows only as Swift loses its last kilometres of altitude. What is not in doubt is the ending itself. Swift was built to catch the sky exploding, and its final act will be a brief, fiery streak of its own — a machine that spent two decades watching the universe's most violent moments, ending in one last, uncontrolled flash. Related reading: NASA's CHAPEA 378-Day Simulated Mars Mission Ends and Comets Did Not Deliver Life's Building Blocks, Study Finds.