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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This small planetary nebula, like others like it, was formed by gases in the outer layers of a dying star.
—
Miguel Claro, Space.com, 22 Mar. 2025
This image features a deep field view of the Cassiopeia constellation immersed in the glow of ionized hydrogen gas, where the two small planetary nebulas can be found, Abell 6 and the larger HFG1.
—Miguel Claro, Space.com, 22 Mar. 2025
This planetary nebula is the remains of a star similar to the sun, which shed most of its mass at the end of its life, with its core becoming a smoldering white dwarf shrouded by this ex-stellar material.
—Robert Lea, Space.com, 5 Mar. 2025
Despite their name, planetary nebulas are not related to planets.
—Carlyn Kranking, Smithsonian Magazine, 23 July 2024
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Miguel Claro, Space.com, 22 Mar. 2025
This image features a deep field view of the Cassiopeia constellation immersed in the glow of ionized hydrogen gas, where the two small planetary nebulas can be found, Abell 6 and the larger HFG1.
—Miguel Claro, Space.com, 22 Mar. 2025
This planetary nebula is the remains of a star similar to the sun, which shed most of its mass at the end of its life, with its core becoming a smoldering white dwarf shrouded by this ex-stellar material.
—Robert Lea, Space.com, 5 Mar. 2025
Despite their name, planetary nebulas are not related to planets.
—Carlyn Kranking, Smithsonian Magazine, 23 July 2024
See All Example Sentences for planetary nebula
Cite this Entry
“Planetary nebula.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/planetary%20nebula. Accessed 22 Apr. 2025.
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