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Planetary nebula


A planetary nebula, often abbreviated as PN or plural PNe, is a kind of emission nebula consisting of an expanding, glowing shell of ionized gas ejected from old  ...

Planetary Nebula: Gas and Dust - Space.com


May 9, 2016 ... In about 5 billion years, when the sun shucks off its outer layers, it will create a beautiful shell of diffuse gas known as a planetary nebula. About ...

What is a planetary nebula? | Cool Cosmos


A planetary nebula is created when a star blows off its outer layers after it has run out of fuel to burn. These outer layers of gas expand into space, forming a ...

Planetary nebula | Define Planetary nebula at Dictionary.com


Planetary nebula definition, an expanding shell of thin ionized gas that is ejected from and surrounds a hot, dying star of about the same mass as the sun; the ...

planetary nebula | astronomy | Britannica.com


Any of a class of bright nebulae that are expanding shells of luminous gas expelled by dying stars. Observed telescopically, they have a relatively round compact ...

Formation of Planetary Nebulae - R Jay Gabany


Peering down into a vast cosmic maelstrom of gas and dust, the central star in this image of NGC 6853, also known as the Dumbbell Nebula, produced this ...

Planetary Nebula: Definition & Facts | Study.com


Planetary nebulas are perhaps one of the most spectacular sights in the night sky . Learn the definition of a planetary nebula, read some cool facts...

Stage 8: Planetary Nebula or Supernova - Astronomy Notes


Feb 17, 2015 ... Stage 8: Planetary Nebula or Supernova. Chapter index in this window — — Chapter index in separate window. This material (including ...

planetary nebula - The Worlds of David Darling


A luminous shell of gas, often of complex structure, cast off and caused to fluoresce by an evolved star of less than about 4 solar masses. Planetary nebulae ...

Planetary Nebulae - SEDS Messier Database


Jul 24, 2014 ... Planetary Nebulae. [Messier Planetary Nebulae] Click icon to view a planetary nebula from Messier's catalog. >> Messier's Planetary Nebulae ...

How Is a Planetary Nebula Formed?
A planetary nebula is formed during the death of a star. Find out about how a planetary nebula is formed with help from an experienced educator in this free video clip.... More »
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Planetary Nebula Sampler - National Optical Astronomy Observatory


A planetary nebula forms when a star can no longer support itself by fusion reactions in its center. The gravity from the material in the outer part of the star takes ...

Planetary nebula - Science Daily


A planetary nebula is an astronomical object consisting of a glowing shell of gas and plasma formed by certain types of stars at the end of their lives. They are in ...

Planetary Nebulae - Williams College


A planetary nebula is a beautiful object created during the final stages of the life of a star whose birth mass was between 1 and 8 solar masses. The wispy ...