evolution of planetary nebulae

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• Planetary nebula luminosity function — (PNLF) is a secondary distance indicator used in astronomy. It makes use of the [O III| [O III] λ5007 forbidden line found in all planetary nebula which are members of the old stellar populations (Population… …   Wikipedia

• Planetary nebula — A planetary nebula is an emission nebula consisting of a glowing shell of gas and plasma formed by certain types of stars when they die. The name originated in the 18th century because of their similarity in appearance to giant planets when… …   Wikipedia

• History of Solar System formation and evolution hypotheses — Capture theory redirects here. For the solar capture theory, see this article s section on Solar System formation. For the lunar capture theory, see this article s section on lunar formation. Ideas concerning the origin and fate of the world date …   Wikipedia

• Formation and evolution of the Solar System — Artist s conception of a protoplanetary disk The formation and evolution of the Solar System is estimated to have begun 4.568 billion years ago with the gravitational collapse of a small part of a giant molecular cloud …   Wikipedia

• Formation et évolution du système solaire — Vue d artiste d un disque protoplanétaire. La formation et l évolution du système solaire sont déterminées par un modèle aujourd hui très largement accepté et connu sous le nom d « hypothèse de la nébuleuse solaire ». Ce modèle fut… …   Wikipédia en Français

• Stellar evolution — Life cycle of a Sun like star Stellar evolution is the process by which a star undergoes a sequence of radical changes during its lifetime. Depending on the mass of the star, this lifetime ranges from only a few million years (for the most… …   Wikipedia

• Stars and planetary systems in fiction — The planetary systems of stars other than the Sun and the Solar System are a staple element in much science fiction. Contents 1 Overview 1.1 The brightest stars …   Wikipedia

• Stingray Nebula — Planetary nebula caption=Hubble Space Telescope photograph of the nebula name = Stingray Nebula type = epoch = J2000 ra = RA|17|16|21.071Harvnb|SIMBAD|2007] dec = DEC| 59|29|23.64 dist ly = 18 kly (5.6 kpc)Harvnb|Parthasarathy|2000] appmag v = 10 …   Wikipedia

• nebula — nebular, adj. /neb yeuh leuh/, n., pl. nebulae / lee , luy /, nebulas. 1. Astron. a. Also called diffuse nebula. a cloud of interstellar gas and dust. Cf. dark nebula, emission nebula, reflection nebula …   Universalium

• Nebulosa planetaria — La Nebulosa Ojo de Gato. Imagen en falso color (visible y rayos X) tomada por el Telescopio espacial Hubble. Una nebulosa planetaria …   Wikipedia Español

• Cat's Eye Nebula — Composite image using optical images from the HST and X ray data from the Chandra X ray Observatory Observation data …   Wikipedia