Crossword Genius

Alarming data leads to hypothesis extrapolating the universe's ultimate fate? (4,5)

Ross

I believe the answer is:

heat death

'the universe's ultimate fate?' is the definition.

I don't understand how the remainder of the clue works.

(Other definitions for heat death that I've seen before include "Possible fate of the universe" , "Universe's end with uniform energy distribution" .)

I've seen this clue in The Independent.
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