planetary nebula
noun
: 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
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Despite their name, planetary nebulas are not related to planets.
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Carlyn Kranking, Smithsonian Magazine, 23 July 2024
Another class of object that the dusty blobs could hypothetically be—but are not—is a compact planetary nebula or CPN.
—Elizabeth Rayne, Ars Technica, 4 July 2024
As a red giant, Arcturus is at the end of its life and will eventually transform into a planetary nebula.
—Elizabeth Gamillo, Discover Magazine, 5 Mar. 2024
Her relative obscurity is a reminder that this planetary nebula, located about 2,300 light-years away from Earth, will outlive us all, as well as any remnant memories of us.
—Eric Berger, Ars Technica, 12 Dec. 2023
See all Example Sentences for planetary nebula 
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Carlyn Kranking, Smithsonian Magazine, 23 July 2024
Another class of object that the dusty blobs could hypothetically be—but are not—is a compact planetary nebula or CPN.
—Elizabeth Rayne, Ars Technica, 4 July 2024
As a red giant, Arcturus is at the end of its life and will eventually transform into a planetary nebula.
—Elizabeth Gamillo, Discover Magazine, 5 Mar. 2024
Her relative obscurity is a reminder that this planetary nebula, located about 2,300 light-years away from Earth, will outlive us all, as well as any remnant memories of us.
—Eric Berger, Ars Technica, 12 Dec. 2023
See all Example Sentences for planetary nebula
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“Planetary nebula.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/planetary%20nebula. Accessed 15 Nov. 2024.
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