planetary nebula

noun

Definition of planetary nebula

: a usually compact luminous ring-shaped nebula that is composed of matter which has been ejected from a hot star at its center

Examples of planetary nebula in a Sentence

Recent Examples on the Web Though the phenomenon is called a planetary nebula, the term is a misnomer. Leslie Nemo, Scientific American, 15 Jan. 2021 Using the organization’s Very Large Telescope (real name) in Chile, the ESO captured a planetary nebula made up of beautiful blue, red, purple, and pink colored clouds of dust and gas in space, CNN reported. Andrea Romano, Travel + Leisure, 3 Aug. 2020 This planetary nebula isn't long for this universe. Scottie Andrew, CNN, 2 Aug. 2020 Yet in 2010, a quarter of a century after their initial discovery in the laboratory, C60 and its cousin C70 were observed in the infrared in planetary nebula Tc1 in the constellation Cygnus. Ryan C. Fortenberry, Scientific American, 1 Feb. 2020 It's long been known that most stars wind up producing a planetary nebula, but astronomers thought the sun — a ball of superheated gas with a diameter 109 times that of Earth — was too small to form a visible nebula. David Freeman /, NBC News, 10 May 2018 Even stars that are just a few percent less massive than the sun will not produce a planetary nebula. Jason Daley, Smithsonian, 9 May 2018 That’s the Stingray Nebula, considered the youngest planetary nebula—a title given to nebulae born of a dying star—which became visible late last century. National Geographic, 20 Mar. 2018

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'planetary nebula.' 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 planetary nebula

1785, in the meaning defined above

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The first known use of planetary nebula was in 1785

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Dictionary Entries Near planetary nebula

planetary house

planetary nebula

planetary science

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Cite this Entry

“Planetary nebula.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/planetary%20nebula. Accessed 27 Oct. 2021.

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More from Merriam-Webster on planetary nebula

Britannica.com: Encyclopedia article about planetary nebula

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