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What counts as a moon? Huge ‘exosatellite’ sparks debate

Research Exoplanet Astronomy

Merged summary

TL;DR - A distant Jupiter-mass object is prompting debate over what qualifies as a moon. The discovery could help advance methods for detecting moons beyond the Solar System.

  • The object is described as an unusually massive potential “exosatellite.”
  • Its classification challenges conventional boundaries between moons and other planetary bodies.
  • The item also notes the discovery of a rare transmissible cancer in catfish.
  • The provided content does not include observational methods or detailed results.

Sources (1)

What counts as a moon? Huge ‘exosatellite’ sparks debate

Nature Benjamin Thompson, Nick Petrić Howe 2026-07-22 doi:10.1038/d41586-026-02299-6

TL;DR - A distant Jupiter-mass object is prompting debate over what qualifies as a moon. The discovery could help advance methods for detecting moons beyond the Solar System.

  • The object is described as an unusually massive potential “exosatellite.”
  • Its classification challenges conventional boundaries between moons and other planetary bodies.
  • The item also notes the discovery of a rare transmissible cancer in catfish.
  • The provided content does not include observational methods or detailed results.
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