Astronomers using NASA's Hubble Space Telescope captured rare imagery of comet C/2025 K1 (ATLAS) shattering into fragments in November 2025. The roughly five-mile-long comet, discovered by the Asteroid Terrestrial-impact Last Alert System in May, passed within 31 million miles of the sun on October 8.

Hubble's observations from November 8-10 revealed the comet breaking into four or five distinct shards, each surrounded by vaporized ice atmospheres. Ground-based telescopes could only see hazy light smudges, but Hubble provided remarkable detail of each fragment. The timing was fortuitous - researchers were initially targeting another comet but switched to K1 when Hubble couldn't point to their original target.

The breakup's unusual characteristics have puzzled scientists. Unlike typical cometary fragmentation where exposed ices immediately vaporize, there was a one-to-three-day delay between each fragment's liberation and its subsequent light show. This rare glimpse into a comet's interior could help explain why short-period comets are less prone to catastrophic fragmentation than long-period comets like K1.