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An accretion disk is a structure (often a circumstellar disk) formed by diffuse material [a] in orbital motion around a massive central body. The central body is most frequently a star . Friction , uneven irradiance, magnetohydrodynamic effects, and other forces induce instabilities causing orbiting material in the disk to spiral inward toward ...
In astrophysics, accretion is the accumulation of particles into a massive object by gravitationally attracting more matter, typically gaseous matter, into an accretion disk. [ 1 ] [ 2 ] Most astronomical objects , such as galaxies , stars , and planets , are formed by accretion processes.
Adobe Photoshop is a raster graphics editor developed and published by Adobe for Windows and macOS.It was created in 1987 by Thomas and John Knoll.It is the most used tool for professional digital art, especially in raster graphics editing, and its name has become genericised as a verb (e.g. "to photoshop an image", "photoshopping", and "photoshop contest") [7] although Adobe disapproves of ...
The disk of a Class 0 protostar is thought to be massive and hot. It is an accretion disk, which feeds the central protostar. [39] [40] The temperature can easily exceed 400 K inside 5 AU and 1,000 K inside 1 AU. [51] The heating of the disk is primarily caused by the viscous dissipation of turbulence in it and by the infall of the gas from the ...
A protoplanetary disk is a rotating circumstellar disc of dense gas and dust surrounding a young newly formed star, a T Tauri star, or Herbig Ae/Be star. The protoplanetary disk may not be considered an accretion disk ; while the two are similar, an accretion disk is hotter and spins much faster.
The current average rate for a 30-year fixed mortgage is 7.13% for purchase and 7.15% for refinance — up 10 basis points from 7.03% for purchase and 9 basis points from 7.06% for refinance last ...
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