Pluto's strange atmosphere is collapsing. After astronomers witnessed the puny world's atmosphere grow from 1988 to 2016, its pressure has dropped more than 20% since. Though some drop was expected as Pluto recedes from the Sun, the precipitous fall was much larger than predicted.

Pluto's strange atmosphere is collapsing. After astronomers witnessed the puny world's atmosphere grow from 1988 to 2016, its pressure has dropped more than 20% since. Though some drop was expected as Pluto recedes from the Sun, the precipitous fall was much larger than predicted.

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