(plural spiral nebulas or spiral nebulae)
spiral + nebula
"spiral-nebula." YourDictionary, n.d. Web. 23 October 2018. <https://www.yourdictionary.com/spiral-nebula>.
spiral-nebula. (n.d.). Retrieved October 23rd, 2018, from https://www.yourdictionary.com/spiral-nebula
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