The fact
Launched in 2004, the astronomical observatory begins an uncontrolled descent toward Earth's atmosphere.
It is expected to disintegrate within a few years, ending its scientific mission.
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Why it matters
La fin de la mission Swift prive les astronomes d'un outil clé pour l'observation des sursauts gamma et des phénomènes cosmiques transitoires, réduisant les capacités de surveillance spatiale.