Marvel character with an interstellar name (6)

I believe the answer is:

nebula

(Other definitions for nebula that I've seen before include "Diffuse cloud of particles and gas in space" , "Mass of interstellar gas" , "Cloud of gas, stars" , "Interstellar gas cloud" , "Cloud of gas and dust in outer space" .)

I've seen this clue in the USA Today.

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