Hubble catches rare view of a comet crumbling

"This comet [was] observed because our original comet was not viewable due to some new technical constraints after we won our proposal. We had to find a new target - and right when we observed it, it happened to break apart, which is the slimmest of slim chances."

"The comet broke up over a period of days into at least four pieces, each with a fuzzy envelope of gas and dust around them, with Hubble specifically capturing the disassembly from November 8 through November 10, 2025. K1 was interesting before it started to crumble because at around 8 kilometers across (about 5 miles), it's larger than the average comet."

"Comets are frequently made of ice and rock from the primordial period when solar systems were first forming. The lack of carbon in the gases released by the comet as it broke is apparently chemically very strange, which suggests the composition of K1 could bear scientific fruit."

NASA and ESA released Hubble Space Telescope images of Comet K1 fragmenting as it departed the solar system, documented in a study published in Icarus. The observation was unplanned—researchers switched targets when their original comet became unobservable due to technical constraints. K1, approximately 8 kilometers across, broke into at least four pieces over several days in November 2025, each surrounded by a fuzzy envelope of gas and dust. The comet's unusual chemical composition, notably lacking carbon in its released gases, presents scientific interest. Comets composed of primordial ice and rock offer valuable information about early solar system formation, making this accidental discovery particularly significant for understanding the universe's origins.

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