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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The expanding gas shell is excited to shine by the high-energy radiation emitted from the ... The shining gas shell is then visible as a planetary nebula. ... and the Owl Nebula M97 in Ursa Major in February 1781 by Pierre Méchain. ... 90 to 95 % of the visible light are emitted in one single emission line only ! ...
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seds.org/MESSIER/planetar.html
seds.org/MESSIER/planetar.html
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planetary nebula; An expanding shell of gas - actually the surface layers - ejected from a medium-mass star during its last stages of evolution a a rate of 20 to 30 km/sec; ... ... The Egg nebula (CRL2688) is a planetary nebula about 3,000 light-years from Earth. This huge cloud of dust and gas is expanding outwards at...
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en.mimi.hu/astronomy/planetary_nebula.html
en.mimi.hu/astronomy/planetary_nebula.html
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The space between the stars is filled with dusty gas. ... The best known is the Ring Nebula in Lyra. Their complex appearances depend to a degree on how matter is lost from the giant stars that make them. Expanding at rates of tens of kilometers per second, ... As the planetary nebula dissipates into the gases of interstellar space,
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stars.astro.illinois.edu/sow/star_intro.html
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The name planetary nebula is misleading, and arose historically because of ... In a symmetrical nebula, light comes partly from the side of the shell nearer the Earth, and partly from the side beyond the central star; if the shell is expanding there will be a difference in wavelength in the light from t he front and back.
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www.blackskies.org/intro.html
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A montage of Planetary Nebulae observed with the Hubble Space Telescope. ... The "second wind" of heat release will be furious, increasing the light emitted from the ... the growing nebula will expand and fade into the background of galactic gas, .... that resemble flying sparks at the edge of the expanding nebula. ...
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www.astro.washington.edu/users/balick/WFPC2/
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light emitted by molecules in the dense clouds of gas surrounding the stars in the nebula. ... The major source of energy in the pre–main-sequence life of the Sun was; ... a runaway nuclear furnace and eventual explosion in the star's interior, destroying the star and leaving only a rapidly expanding shell of gas.
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physics.ship.edu/~mrc/pfs/108/nstudy6/prc20_22.htm
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a rapidly expanding shell of gas and a central neutron star. ... The source of the beams of electromagnetic radiation (including light in some cases) emitted by pulsars is; ... the distance to which gas is ejected in a planetary nebula.
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physics.ship.edu/~mrc/pfs/108/nstudy7/prctch23-4.htm
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C) The chemical makeup of the original nebula is the major factor in deciding the rate of evolution, whatever the mass of the star. ... 22. The major source of light in the expanding shell of gas in a planetary nebula is...
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www.commnet.edu/tx_acad/Examinations/Astronomy/Astronom...
www.commnet.edu/tx_acad/Examinations/Astronomy/Astronomy%20Examination%20III.htm
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