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Planetary nebula, any of a class of bright nebulae that are expanding shells of luminous gas expelled by dying stars. They have a relatively round compact appearance rather than the chaotic patchy shapes of other nebulae—hence their name, which was give
Explore planetary nebulae. Learn the definition of a planetary nebula and understand its structure and chemical composition. Find out how a...
Phrases Containing planetary planetary nebula planetary science Dictionary Entries Near planetary planetarium planetary planetary configuration See More Nearby Entries Cite this Entry Style “Planetary.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/...
Planetary nebulaThe ejected outer layers of stars born with mass between approximately 1 and 8 times the solar mass.…De Marco, Orsola
Define planetary. planetary synonyms, planetary pronunciation, planetary translation, English dictionary definition of planetary. adj. 1. Of, relating to, or resembling the physical or orbital characteristics of a planet or the planets. 2. a. Of or relat
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Define Planetary body. Planetary body synonyms, Planetary body pronunciation, Planetary body translation, English dictionary definition of Planetary body. n. 1. a. In the traditional model of solar systems, a celestial body larger than an asteroid or com
Planetary Nebula Definition A planetary nebula is the glowing shell of gas, typically one light-year across, ejected during the late AGB phase of intermediate and low mass stars. The name derives from the appearance in a small telescope, similar to that of a planet. It surrounds the hot, ...
Definition A planetary nebula is the glowing shell of gas, typically one light-year across, ejected during the late AGB phase of intermediate and low mass stars. The name derives from the appearance in a small telescope, similar to that of a planet. It surrounds the hot, luminous core of ...