coplanarity
noun 2
Definitions
noun
1
The state or characteristic of being within the same plane.
2
The state or characteristic of orbiting a central celestial object within the same orbital plane.
Gliese 876 affords us by far our most detailed and accurate map of any extrasolar planetary system in the solar neighborhood, and […] it is reassuring to see a kinship in the most fundamental property of system coplanarity.
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