I need help explicating a poem and writing a short essay!

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3rd April, 2019
Mercury’s Descent: Why I’m Leaving You
Mercury is shrinking--Notice here the mercury planet mentioned
4.4 miles and counting,
They say its sole continental plate is failing--Notice here the concrete images of continental plate, pieces and feet.
Its frenetic pieces losing its feet.
I want to know:
Will the pieces reform themselves, having accepted theConcrete image of pieces repeated. Also note contradicting words such as light and darkness, living and the dead.
inevitable?
Will they decide to spin light in a faithless dance?
Will they accept that darkness is the arc of the living and
the dead?
Pluto, another planet mentioned along with its Kupier belt.
Planets come and go--
Think of Pluto stripped of its identity,
Shamed in the Kupier belt,
Now a dwarf among respectable planets.
Notice here a person, Keat who is a poet mentioned. Capturing phrases such as fading light, soft-dying day.
Keats taught...