cir·​cum·​stel·​lar | \ ˌsər-kəm-ˈste-lər How to pronounce circumstellar (audio) \

Definition of circumstellar

: surrounding or occurring in the vicinity of a star circumstellar dust

Examples of circumstellar in a Sentence

Recent Examples on the Web Planets form from a disk of gas and dust around a star, called the circumstellar disk. Ashley Strickland, CNN, "Carbon-rich planets made of diamonds may exist beyond our solar system, study says," 14 Sep. 2020 This is where planets form, and it's called the circumstellar disk. Ashley Strickland, CNN, "Tatooine-like exoplanet could be orbiting in this triple-star system," 3 Sep. 2020 Meanwhile the study of circumstellar disks and planet formation has exploded. Meredith A. Macgregor, Scientific American, "Astronomers Watch as Planets Are Born," 19 May 2020 This band is called the circumstellar habitable zone (CHZ) and has become one of the central ideas driving scientists’ thoughts about life on exoplanets. James Trefil And Michael Summers, Smithsonian Magazine, "If Aliens Exist Elsewhere in the Universe, How Would They Behave?," 31 Dec. 2019 Called circumstellar disks, these structures are the milieu in which planets form—although the exact process by which worlds emerge from the dust is unknown. Nadia Drake, National Geographic, "Alien moon likely seen forming in first-of-its-kind picture," 12 July 2019 The newborn star lit up with nuclear fusion, sending light and heat out into the spinning circumstellar disk. Sarah Kaplan,, "Many asteroids might be remnants of 5 destroyed worlds, scientists say," 3 July 2018 Nesvorny and many others now think that gravity kicks in once clumps in the circumstellar disk reach the pebble stage, swiftly pulling together massive amounts of material to form a huge new planet. Sarah Kaplan,, "Many asteroids might be remnants of 5 destroyed worlds, scientists say," 3 July 2018 As with the circumstellar disk hypothesis, the lack of infrared emission is a problem. Kimberly Cartier, Scientific American, "Have Aliens Built Huge Structures around Boyajian’s Star?," 1 May 2017

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'circumstellar.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

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First Known Use of circumstellar

1951, in the meaning defined above

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The first known use of circumstellar was in 1951

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Cite this Entry

“Circumstellar.” Dictionary, Merriam-Webster, Accessed 29 Nov. 2020.

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