Noun
- plural form of supermassive black hole
supermassive-black-holes
English Wiktionary. Available under CC-BY-SA license.
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"supermassive-black-holes." YourDictionary, n.d. Web. 16 January 2019. <https://www.yourdictionary.com/supermassive-black-holes>.
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supermassive-black-holes. (n.d.). Retrieved January 16th, 2019, from https://www.yourdictionary.com/supermassive-black-holes
