Science

Astronomers may have discovered the first moon beyond our Solar System

Astronomers have uncovered evidence of a bizarre, potentially historic discovery: the first moon ever detected beyond our Solar System.

✦ Extractive summary — built from the sources' own reporting•From 1 source•1 min read•Updated October 25, 2026, 3:13 AM UTC
Key points
  • Astronomers have uncovered evidence of a bizarre, potentially historic discovery: the first moon ever detected beyond our Solar System.
  • Unlike familiar moons, this mysterious object is at least as massive as Jupiter and orbits a brown dwarf, which itself circles a star.
  • The unusual arrangement challenges traditional definitions of planets and moons, leaving scientists unsure what to call it.

Astronomers have uncovered evidence of a bizarre, potentially historic discovery: the first moon ever detected beyond our Solar System.

Unlike familiar moons, this mysterious object is at least as massive as Jupiter and orbits a brown dwarf, which itself circles a star.

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