单词	planetary nebula
释义	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 Example Sentences Recent Examples on the Web The leftovers of a star that went supernova are called planetary nebula. Jamie Carter, Forbes, 23 July 2022 Famous examples of planetary nebula include: Ring Nebula (M57) in the constellation of Lyra. Jamie Carter, Forbes, 23 July 2022 This large planetary nebula includes an expanding cloud of gas around a dying star. Ashley Strickland, CNN, 12 July 2022 Southern Ring Nebula: This is an example of a planetary nebula, which has nothing to do with planets. John Timmer, Ars Technica, 8 July 2022 In one image of the Southern Ring planetary nebula, the shells of gas and dust ejected from dying stars like our sun, provide detail from the late stages of a star’s life. Camille Fine, USA TODAY, 12 July 2022 The Southern Ring planetary nebula – an expanding cloud of gas surrounding a dying star - is 2,000 light-years away from Earth. Jamie Carter, Forbes, 9 July 2022 Those intense stellar winds will eventually expel the atmosphere and stellar envelope, and the star will become a white dwarf star within a planetary nebula. Jennifer Ouellette, Ars Technica, 29 Mar. 2022 Though the phenomenon is called a planetary nebula, the term is a misnomer. Leslie Nemo, Scientific American, 15 Jan. 2021 See More Word History First Known Use 1785, in the meaning defined above
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