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The most comprehensive plans need a sprinkle of luck, even in space. In October 2022 the T James Webb Space Telescope watched as Chariklo, a tiny ringed asteroid, eclipsed a star. This event, called an occultation, marked a first for Webb. At the month’s end, Webb turned towards Chariklo again and notched another victory: For the first time, astronomers analysing the telescope’s data spotted clear signs of water ice, the presence