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
There is still not a consensus on the cause of the wide variety of shapes. However, astronomers have proposed stellar winds and the presence of other astronomical bodies as potential causes. The Little Dumbbell planetary nebula.Life of Planetary Nebulae Facts About Planetary Nebula Lesson Summary ...
Explore planetary nebulae. Learn the definition of a planetary nebula and understand its structure and chemical composition. Find out how a...
These facts confirm that these two objects are PPNs in transition between the asymptotic giant branch and planetary nebula phases. Hubble Space Telescope imaging reveals that they are indeed bipolar nebulae. IRAS 17245-3951 clearly displays two lobes separated by a dust lane; thus it is viewed ...
a low mass star dies and they generally live less than a million years. They are also considered to be rare. Planetary nebulae occur in a variety of shapes and sizes and they play an important role in the evolution of the universe.Read Planetary Nebula | Definition, Facts & Structure ...