NASA’s 22-Year-Old Swift Space Telescope Re-Enters Earth’s Atmosphere Over Indonesia
The observatory completed a mission lasting nearly 22 years, far exceeding its original two-year design life.
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NASA’s Neil Gehrels Swift Observatory re-entered Earth’s atmosphere over northern Sumatra, Indonesia, on November 4, ending nearly 22 years in orbit. The spacecraft studied gamma-ray bursts, supernovae and other cosmic phenomena, operating far beyond its original two-year mission. NASA expected most of the telescope to burn up during re-entry.
NASA's Swift Observatory returns to Earth
NASA's Neil Gehrels Swift Observatory re-entered Earth's atmosphere on Wednesday, November 4, over northern Sumatra, Indonesia, bringing an end to a nearly 22-year mission studying some of the universe's most powerful events.
The spacecraft re-entered at approximately 7:39 a.m. Eastern Time, according to tracking information cited by Reuters. The observatory weighed around 3,200 pounds (1,450 kilograms) and had spent more than two decades orbiting Earth.
NASA expected most of the spacecraft to burn up as it passed through the atmosphere. Some of its denser components may have survived the descent, but the agency had estimated the risk of harm to anyone on Earth at approximately one in 2,100.
A mission that lasted far longer than planned
Swift launched in November 2004 with an original primary mission designed to last approximately two years. It was built to detect gamma-ray bursts, extremely energetic explosions associated with events such as the collapse of massive stars and the merging of compact stellar objects.
The observatory used three telescopes to detect these bursts and quickly direct its instruments toward their locations. It also helped scientists study supernovae, black holes, stellar flares, comets and asteroids.
Its observations supported thousands of scientific studies and helped researchers better understand high-energy events across the universe.
The spacecraft was renamed the Neil Gehrels Swift Observatory in 2018, in honour of its first principal investigator, who died in 2017.
Why did the telescope fall back to Earth?
Like other spacecraft in low Earth orbit, Swift experienced atmospheric drag. Increased solar activity in recent years expanded Earth's upper atmosphere, increasing drag and causing the observatory's orbit to decay more rapidly.
