accretion disks

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• Accretion disc — An accretion disc (or accretion disk) is a structure (often a circumstellar disk) formed by diffuse material in orbital motion around a central body. The central body is typically either a young star, a protostar, a white dwarf, a neutron star,… …   Wikipedia

• Disque d'accrétion — Une vue d artiste d un système stellaire binaire composé d un trou noir et une étoile de la séquence principale. Le disque d accrétion et les jets de radiations électromagnétiques sont représentés en bleu. Un disque d accrétion est une structure… …   Wikipédia en Français

• Nebular hypothesis — Star formation Interstellar medium Molecular cloud …   Wikipedia

• Magnetorotational instability — The magnetorotational instability or MRI is a fluid instability that arises when the angular velocity of a magnetized fluid decreases as the distance from the rotation center increases. It can also be known as the Velikhov Chandrasekhar… …   Wikipedia

• Black hole — For other uses, see Black hole (disambiguation). Simulated view of a black hole (center) in front of the Large Magellanic Cloud. Note the gravitat …   Wikipedia

• Donald Lynden-Bell — Born April 5, 1935 (1935 04 05) (age 76) Dover, United Kingdom Fields Astro …   Wikipedia

• Polar jet — You may be looking for relativistic jet, a polar jet emitted at relativistic speed. A polar jet is a phenomenon often seen in astronomy, where streams of matter are emitted along the axis of rotation of a compact object. It is usually caused by… …   Wikipedia

• Herbig-Haro object — Herbig Haro objects are small patches of nebulosity associated with newly born stars, and are formed when gas ejected by young stars collides with clouds of gas and dust nearby at speeds of several hundred kilometres per second. Herbig Haro… …   Wikipedia

• 2M1207 — Starbox begin name = 2M1207Starbox image caption = European Southern Observatory infrared image of 2M1207 (bluish) and companion planet 2M1207b (reddish), taken in 2004.Starbox observe epoch = J2000.0 (ICRS) constell = Centaurus ra =… …   Wikipedia

• Intermediate polar — Diagram of an intermediate polar. Matter flows from the companion star into an accretion disk around the white dwarf, but is disrupted by the white dwarf s magnetic field. An Intermediate Polar (also DQ Herculis Star) is a type of cataclysmic… …   Wikipedia

• History of the Earth — For the history of modern humans, see History of the world. Geological time put in a diagram called a geological clock, showing the relative lengths of the eons of the Earth s history The history of the Earth describes the most important events… …   Wikipedia