"A fragile juxtaposition of land, oceans, and clouds," per Neil deGrasse Tyson (5)

I believe the answer is:

earth

(Other definitions for earth that I've seen before include "our home" , "Familiar example of 1 Across" , "See 12" , "World - soil" , "Fox's burrow" .)

I've seen this clue in The New York Times.

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