Hubble Space Telescope Accidentally Records Violent Fragmentation of Comet C/2025 K1 During Routine Deep Space Observation

The Hubble Space Telescope captured Comet C/2025 K1 (ATLAS) disintegrating by pure chance, offering a rare look at the interior of a 5-mile-wide icy relic.

By: AXL Media

Published: Apr 28, 2026, 6:20 AM EDT

Source: Information for this report was sourced from NASA, the European Space Agency (ESA), and Auburn University

Serendipitous Discovery Following Tactical Target Shift

A high-stakes scientific "accident" has provided astronomers with a front-row seat to the destruction of a celestial object. In November 2025, the Hubble Space Telescope, a collaborative mission between NASA and the European Space Agency (ESA), captured Comet C/2025 K1 (ATLAS) as it fractured into several distinct pieces. The observation was entirely unplanned, as the research team, led by Principal Investigator Dennis Bodewits and Co-investigator John Noonan of Auburn University, had only pivoted to K1 after technical limitations prevented them from viewing their original target. Noonan only realized the significance of the data the following day when he discovered four distinct comas in images where only one had been expected.

Chronicle of a Solar System Relic’s Demise

The Hubble sequence consists of three 20-second exposures taken between November 8 and November 10, 2025. These high-resolution frames reveal the comet’s nucleus splitting into at least four primary fragments, with one smaller piece observed disintegrating further during the three-day window. While ground-based telescopes could only detect faint, indistinguishable blobs of light, Hubble’s Space Telescope Imaging Spectrograph (STIS) was able to resolve each fragment, each encased in its own fuzzy envelope of gas and dust. This is the first time in the telescope's history that such a fragmentation event has been documented so soon after its initiation.

The Thermal Stress of Perihelion Passage

The likely catalyst for the breakup was the comet’s perihelion passage on October 8, 2025, during which it swung within 31 million miles of the Sun. Passing inside the orbit of Mercury, the 5-mile-wide icy body was subjected to extreme thermal stress and solar radiation. Astronomers believe the intense heat caused the sublimation of subsurface ices into gas, creating internal pressure that eventually overwhelmed the comet's fragile structure. Analysis suggests the disintegration began approximately eight days before Hubble’s first frame, placing the observation at the critical aftermath of the initial fracture.