Nebular hypothesis - Wikipedia, the free encyclopedia
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In cosmogony, the nebular hypothesis is the most widely accepted model explaining the formation and evolution of the Solar System. It was first proposed in 1734 by Emanuel Swedenborg.
en.wikipedia.org/wiki/Nebular_hypothesis
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Emission nebulae are formed when energetic ultraviolet light from a very hot star excites a cloud of hydrogen gas; the UV radiation ionizes the hydrogen (it strips electrons from the hydrogen atoms). The free electrons combine with protons, forming hydrogen and red light.
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www.enchantedlearning.com/subjects/astronomy/stars/nebu...
www.enchantedlearning.com/subjects/astronomy/stars/nebulae.shtml
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Learn How Big Space Is With KidsAstronomy.com ... Although this third type of nebulae is called a planetary nebulae, it actually has nothing to do with planets. A planetary nebulae is formed when a dying sun sized star begins to shed its outer layers.
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www.kidsastronomy.com/nebulae.htm
www.kidsastronomy.com/nebulae.htm
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a nebula is formed when the remains of a star are left over and a gravtiational force pulls together dust and gas to create the first stage of a star cylce which they begin as nebulae.
http://wiki.answers.com/Q/How_is_a_nebula_formed
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The first point that has to be made is that axisymmetric nebulae resulting from stellar outflows and explosions are very common. ... (ii) A high density contrast ( ) can be formed (at least at a few stellar radii). (iii) The velocity of the material in the equatorial plane is considerably smaller than in the polar direction.
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www.stsci.edu/stsci/meetings/shst2/liviom.html
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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. Stars and planets are formed out of nebulas when gravity condenses the gas into objects.
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www.kinderscience.com/nebulas.htm
www.kinderscience.com/nebulas.htm
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Reflection Nebulae ... Dark Nebulae ... Planetary nebulae are formed in the process of mass loss during which red giant stars ultimately become white dwarfs.
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www.ing.iac.es/PR/science/stars.html
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Much as a butterfly emerges when its chrysalis is ejected, planetary nebulae are formed when a red giant star ejectes its outer layers as clouds of ...
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www.astro.washington.edu/users/balick/WFPC2/
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Open star cluster M16 has formed from this great gaseous and dusty cloud, the diffuse Eagle Nebula IC 4703, which is now caused to shine by emission light, excited by the high-energy radiation of its massive hot, young stars.
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seds.lpl.arizona.edu/messier/m/m016.html
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