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
Life of Planetary Nebulae Facts About Planetary Nebula Lesson Summary Register to view this lesson Are you a student or a teacher? I am a student I am a teacher Recommended Lessons and Courses for You Related Lessons Related Courses Planetary Nebula Definition, Features & Facts White Dwarf ...
Explore planetary nebulae. Learn the definition of a planetary nebula and understand its structure and chemical composition. Find out how a...
The meaning of PLANETARY is of, relating to, being, or resembling a planet. How to use planetary in a sentence.
For example, the potassium-to-uranium ratio of the lunar mantle is about 15 of the value postulated for Earth's mantle. Potassium is a volatile element that would have been retained as vapor in the planetary nebula at lower temperatures than uranium. Likewise, lunar samples are depleted in ...
Define planetary ring. planetary ring synonyms, planetary ring pronunciation, planetary ring translation, English dictionary definition of planetary ring. Planetary rings, made up of millions of particles, are known to orbit the planets Jupiter, Saturn,
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Planetary Instrument Definition and Development Program Planetary Interactive GIS on-the-Web Analyzable Database Planetary Laboratory for Image Analysis Planetary Landing Observation Package Planetary Mass Object Planetary Materials and Geochemistry Program Planetary Moons planetary nebula planetary nebula planetary ...
If the IAU’s definition were consistently applied, the crust of Europa would be a “non-planetary crust” because crusts would not be characteristic of planets and in particular Europa’s would be an example of a crust from a non-planet. The same would be true for planetary albedo, ...
An important parameter of this problem is the xenon-isotope composition of the atmosphere of Jupiter, which contains gases gravitationally captured from the solar nebula. Results from the Galileo Probe mass spectrometer (Mahaffy et al., 1998) have narrowed the range of possible nebular-xenon ...