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Planetary nebula

en.wikipedia.org/wiki/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

www.space.com/17715-planetary-nebula.html

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

coolcosmos.ipac.caltech.edu/ask/225-What-is-a-planetary-nebula-

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

www.dictionary.com/browse/planetary-nebula

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

www.britannica.com/topic/planetary-nebula

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

www.cosmotography.com/images/planetary_nebula_formation.html

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

study.com/academy/lesson/planetary-nebula-definition-facts-quiz.html

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

www.astronomynotes.com/evolutn/s6.htm

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

www.daviddarling.info/encyclopedia/P/planneb.html

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

messier.seds.org/planetar.html

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

Answer
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 »
Difficulty: Moderate
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Planetary Nebula Sampler - National Optical Astronomy Observatory

www.noao.edu

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

www.sciencedaily.com

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

web.williams.edu

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 ...