The Neil Gehrels Swift Observatory space telescope has completed its nearly 22-year-long work. On 4 November 2026, it entered Earth's atmosphere and burned up over the North Sumatra region of Indonesia.
NASA confirmed that the re-entry occurred at 7:39 US Eastern Time. The spacecraft, weighing about 1450 kg, burned up in the atmosphere as expected. Most of the structure burned up at high altitude, although some fragments may have reached the surface.
Swift was launched on 20 November 2004. The mission was originally planned for two years, but the telescope operated more than ten times longer. It studied gamma-ray bursts — the most powerful explosions in the Universe — using three telescopes operating in different ranges.
Scientific observations ceased on 20 October 2026. The spacecraft's orbit descended below 275 km, and it entered safe mode. An attempt to rescue the telescope using a special spacecraft, LINK, launched in July 2026, failed due to technical malfunctions.
The accelerated orbital decay was facilitated by increased solar activity. The solar maximum expanded the upper layers of the atmosphere, increasing drag. The risk to people on Earth was assessed as extremely low — approximately a one in 2100 chance.
So what will remain of Swift after its bright finale? The mission's data archive — nearly 12 terabytes of observations — will continue to help astronomers in their research for many years to come.
The Swift mission demonstrated how important rapid observations of fleeting cosmic events are. Its legacy inspires new projects in astrophysics.