The discovery of a distant 'exomoon' the size of Jupiter is changing how we think about the cosmos.

"This system is somewhat hard to define using solar-system-based words like 'planet' and 'moon.'"

Astronomers discovered a moon-like object orbiting a brown dwarf that's orbiting a star. Say that three times fast.

Object orbits a brown dwarf, which circles another star, confusing the cosmic taxonomy

The discovery of a distant 'exomoon' the size of Jupiter is changing how we think about the cosmos.