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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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Source: www.ehow.com

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  ...

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 ...

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 ...

www.britannica.com/topic/planetary-nebula

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 ...

www.noao.edu/jacoby

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 ...

www.sciencedaily.com/terms/planetary_nebula.htm

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 ...

stars.astro.illinois.edu/sow/pn.html

Planetary nebulae, some of the loveliest objects in the sky, are complex shells of gas that have been ejected by dying advanced giant stars like Mira. They were ...

curious.astro.cornell.edu/about-us/80-the-universe/stars-and-star-clusters/stellar-remnants/366-are-planetary-nebulae-the-result-of-supernovae-intermediate

Jun 27, 2015 ... No, they are two entirely different things. A planetary nebula is born when a low mass star dies (low mass means less than about 8 times the ...

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 ...