The Neil Gehrels Swift Observatory, a space telescope operated by NASA, is anticipated to re-enter Earth’s atmosphere on November 4 at approximately 3:30 am ET. The 3,200-pound spacecraft will undergo an uncontrolled descent and is expected to burn up almost entirely upon entry, though some components may survive and fall within a limited geographic band spanning 20.6 degrees south to 20.6 degrees north latitude. NASA estimates the risk of harm to people on Earth at approximately 1 in 2,100.
Launched in 2004, the observatory was originally designed to operate for just two years but instead functioned for more than two decades. The satellite carried three telescopes dedicated to detecting and analyzing gamma-ray bursts, among the most powerful explosions known to occur in the universe. Over its operational lifetime, the observatory detected and tracked more than 2,000 gamma-ray bursts, which scientists believe may result from black hole formation in massive stellar explosions or collisions between neutron stars, though the exact cause remains unknown. These bursts occur roughly once daily and range in duration from milliseconds to several hundred seconds.
Among its notable achievements, Swift observed a tidal disruption event earlier in the year involving a supermassive black hole consuming a star located approximately 30,000 light-years from the center of its host galaxy. The event temporarily outshone the galaxy’s ultraviolet radiation output with the brightness equivalent of roughly 10 billion suns. This observation contributed to ongoing research into wandering supermassive black holes that have migrated from their galaxies’ cores.
NASA had attempted to extend the satellite’s operational life by pushing it into a higher orbit through a private space contractor approximately one year prior, but the rendezvous mission was unsuccessful. Following this failed rescue effort, Swift was commanded to cease operations last month and prepare for atmospheric re-entry. The agency notes that the observatory has substantially contributed to understanding various cosmic phenomena, including active galaxies, stellar X-ray flares, supernova explosions, and solar system objects.
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