[Martin Elster]

This one could be about the hypothetical Planet Nine or perhaps an exoplanet.

Long-Distance Relationship

The planet takes nine hundred thousand years
to orbit the small orb that is her light.
Though practically free-floating, a loose bond
connects the couple. No refulgent spheres
ever visit. Never-ending night
engulfs that world of winter, far beyond
the mass of Jupiter—a giant’s giant.
In their long-distance dalliance, world and star
circumgyrate, aching to embrace.
Their tie is tenuous, a link reliant
on faith a sun won’t pass too near and jar
the planet into interstellar space.
Yet in the face of time’s eternal frost
they vow their love will never be star-crossed.