The Crab, the Ant or the Tarantula, e.g. (6)

I believe the answer is:

nebula

(Other definitions for nebula that I've seen before include "Interstellar gas cloud" , "Cloudy mass in the heavens" , "Bright patch in sky from distant galaxy (6)." , "Diffuse cloud of particles and gas in space" , "Bright patch in sky caused by distant galaxy" .)

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

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