Accepted Hubble Debris-Disk Study
Hubble catches Beta Pictoris's Cat's Tail in visible light
Six epochs reveal the immense debris feature beyond the main disk and point to porous, organic-rich grains from a collision between dwarf-planet-scale bodies.
Briefed September 25, 2026 · Aliens in the Clouds
Feature Detected · Grain Properties Modeled
Researchers combined six Hubble Space Telescope STIS coronagraphic datasets collected from 2012 through 2025. The deeper composite traces the Beta Pictoris disk to a projected 500 astronomical units for the first time in Hubble data and detects the visible-to-near-infrared scattered-light counterpart of the curved feature that JWST previously revealed in the mid-infrared and nicknamed the Cat's Tail.
Injection-and-recovery tests place the scattered-light flux at 0.1 to 0.4 percent of the feature's JWST 15.5-micrometer flux. Modeling that ratio favors highly porous grains made almost entirely of organic refractory material. Using Solar System dwarf planets and interstellar dust as composition guides, the team estimates that colliding progenitors would each need at least roughly one to three times 10^21 kilograms—comparable to Charon or Makemake. The accepted paper also reports an outer-halo warp and brightness asymmetry; organics and a dramatic shape are natural dust properties, not biosignatures or technology.
Why it matters
The same debris structure is now measured in widely separated wavelength regimes, tightening the physics of a recent collision in one of the best-observed young planetary systems.
What the source establishes
Accepted ApJ Letters study using six Hubble epochs and injection-recovery tests. The feature and flux ratio are measured; grain composition and progenitor sizes come from models and analogues.
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