Its first episode was "The Making of a Natural History Film” (4)

I believe the answer is:

nova

(Other definitions for nova that I've seen before include "Newly bright star" , "Star that becomes much brighter for short time" , "Star that ejects a cloud, thus becoming brighter" , "Star briefly brightening" , "Suddenly bright star" .)

I've seen this clue in The Wall Street Journal.

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