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NASA’s Swift Observatory Ends Science Mission as Re-entry Nears

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NASA’s Neil Gehrels Swift Observatory has ended science operations after more than 21 years studying gamma-ray bursts and other energetic events across the universe. The spacecraft is expected to re-enter Earth’s atmosphere in the coming weeks, NASA said Oct. 23.

Swift was designed for a two-year mission, but remained productive for more than a decade beyond that plan. NASA reports that the observatory helped detect more than 2,000 gamma-ray bursts and supported thousands of scientific papers.

The end came as solar activity increased atmospheric drag on the satellite in low Earth orbit. Swift’s orbit sank rapidly, making it harder for its telescopes to hold a steady view of astronomical targets.

NASA said Swift reached an altitude of 171 miles on Oct. 20 and entered safe mode after it could no longer compensate for the drag. The operations team at Penn State then sent a command that ended the mission.

A commercial spacecraft servicing effort was intended to boost Swift into a higher orbit and extend its work. NASA and contractor Katalyst Space abandoned the planned capture and boost in August after the LINK spacecraft developed an attitude-control problem.

Swift briefly resumed observations after that attempt was called off. NASA said it collected hundreds of observations, including remnants of stellar explosions, active black holes and comets, before drag again made stable pointing impractical.

The observatory’s speed in responding to gamma-ray bursts made it a valuable early-warning instrument: it could turn toward a detected event in roughly a minute and alert other telescopes to investigate. NASA says other missions can cover parts of Swift’s work, though no single replacement has the same combination of capabilities.

NASA has not given a specific re-entry date. The agency says the spacecraft is expected to break up in the atmosphere in the next few weeks; it is monitoring the orbit and will post updates through the Swift mission blog.

For Gettysburg-area readers, Swift’s ending is a reminder that long-running science missions can outlast their original plans, while the loss of one observing platform leaves researchers with a gap even when other instruments remain available. This account draws on NASA’s mission updates and reporting by The Associated Press.

Sources: NASA: Mission ends ahead of re-entry | NASA: Mission science record | The Associated Press: Swift observatory’s final days

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