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There are many types of nebulas. The main types are planetary nebulas; diffuse nebulas; supernova remnants; reflection nebulas and dark nebulas. Planetary nebulas are “skin” (or shells) that an old, average-sized star sheds during the red giant stage.
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library.thinkquest.org/J002129F/nebulas/intro.htm
library.thinkquest.org/J002129F/nebulas/intro.htm
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Nebula - Wikipedia, the free encyclopedia
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A nebula (from Latin: "cloud" ; pl. nebulae or nebulæ , with ligature or nebulas ) is an interstellar cloud of dust, hydrogen gas, helium gas and plasma. Originally nebula was a general n...
en.wikipedia.org/wiki/Nebula
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Space.com explains nebula, orion nebula, crab nebula, nebulas and planetary nebula. ... Nebulas are generally classified according to the degree of luminosity. The most common types of nebulas include planetary nebulas and diffuse nebulas. Diffuse nebulas consist of reflecting nebulas, emission nebulas, and dark nebulas.
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www.space.com/nebulas/
www.space.com/nebulas/
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A short discussion, part of a web page on plasma ... In this stage, the central part of the star, ... As more nuclear fuel is consumed, the inner core collapses to a final high density state and the burning in the shell increases in intensity. This state is unstable and the star pulsates, ejecting much of its outer envelope.
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fusedweb.llnl.gov/CPEP/Chart_Pages/5.Plasmas/Nebula/Pla...
fusedweb.llnl.gov/CPEP/Chart_Pages/5.Plasmas/Nebula/Planetary.html
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Nebulas (also called nebulae); Nebulas are clouds of gas and dust particles spread out through There are several types of nebulas. Click on the icons below to learn about the different types. Planetary nebulas are nebulas that when viewed through a small telescope can bear a striking resemblance to planets.
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www.synapticsystems.com/sky/wonders/nebula1.html
www.synapticsystems.com/sky/wonders/nebula1.html
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Cosmic Clouds; Types of Nebulae; Stellar Nurseries; Famous Nebulae ... Types of Nebulae ... The word "nebula" is derived from the Latin word for "clouds". Indeed, a nebula is a cosmic cloud of gas and dust floating in space. More than one nebula are called nebulae. Nebulae are the basic building blocks of the universe.
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www.seasky.org/celestial-objects/nebulae.html
www.seasky.org/celestial-objects/nebulae.html
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Why are the images in black and white? ... 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 its inevitable toll on the structure of the star, and forces the inner parts to condense and heat up. ... Despite the name,
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www.noao.edu/jacoby/pn_gallery.html
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Nebulas are large clouds of gas in space often measuring light years in size and are made up of hydrogen, helium and star dust. Nebulas are formed in two ways: (1) from the creation of the solar system or two from the gas left behind from stars that have exploded in a super nova or nova.
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www.kinderscience.com/nebulas.htm
www.kinderscience.com/nebulas.htm
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Some nebulas are regions where new stars are being formed, while others are the remains of dead or dying stars. Nebulas come in many different shapes and sizes. There are four main types of nebulas: Planetary nebulas, Reflection nebulas, Emission nebulas, and Absorption nebulas.
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coolcosmos.ipac.caltech.edu/cosmic_kids/AskKids/nebula_...
coolcosmos.ipac.caltech.edu/cosmic_kids/AskKids/nebula_whatis.shtml
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