NASA’s Swift telescope plunges back to Earth

Scientific American · Adam Kovac · 2026-11-04 16:45 UTC

The observatory had spent decades studying powerful cosmic explosions and was the target of an unsuccessful rescue mission earlier this year

After more than two decades of observing some of the universe’s most powerful explosions, NASA’s Neil Gehrels Swift Observatory has ended its mission with some fireworks of its own.

The 3,200-pound (1.5-metric-ton) space telescope, which gathered data on gamma-ray bursts (GRBs), was projected to enter Earth’s atmosphere in the early-morning hours of November 4. Most of Swift should have burned up, although experts expected that a small fraction of its most durable components would survive the plunge and reach the planet’s surface. NASA officials estimated an approximately one-in-2,100 chance that Swift’s falling debris would harm anyone. The observatory’s fiery swan song leaves a hole in NASA’s space science fleet that is unlikely to be filled anytime soon.

Swift made its last observation on October 20, after which its orbit descended to just below 171 miles (275 kilometers) above Earth, making continued operations impossible.

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