There has been a request for this article, or a section of this article, to be expanded. See the request on the listing or elsewhere on this talk page. Once the improvements have been completed, you may remove this notice and the page's listing.
It has been suggested that disc (galaxy) be merged into this article or section. (Discuss)
Disc galaxies are galaxies which have discs, a flattened circular volume of stars. These galaxies may, or may not include a central non-disc-like region (central bulge). Wikipedia Logo File links The following pages link to this file: Talk:Amino acid Australian Army Boxing Bioterrorism Brick Broadway (Manhattan) Geography of Canada Transportation in Chile Confucius Colorado Rockies Origins beliefs Democracy Document Type Definition Equuleus East Slavic languages Flanders Fifth Monarchy Men Grenada Geyser Harry Potter Information explosion... Image File history File links Please see the file description page for further information. ... It has been proposed below that Disc (galaxy) be renamed and moved to galactic disc. ... A disc is a component of disc galaxies, such as spiral galaxies, or lenticular galaxies. ... In astronomy, a bulge is a huge, tightly packed group of stars. ...
The Spindle Galaxy (NGC 5866), a lenticular galaxy in the Draco constellation.
A lenticular galaxy is a type of galaxy which is an intermediate between an elliptical galaxy and a spiral galaxy in the Hubble sequence classification scheme.
Lenticular galaxies are discgalaxies (like spiral galaxies) which have used up or lost their interstellar matter (like elliptical galaxies).
If, instead of observing the spectra of stars at the edge of a galaxy we use stars within the structure of the galaxy, we have an additional complication, in that some of the material of the galaxy is beyond the star, and so attracts the star away from, rather than towards the galactic centre.
The simulation treats the material of the galaxy as a large number of uniformly distributed points, and the contribution of each to the acceleration of the test mass is computed and summed.
Provided the thickness of the disc remains a small fraction of its diameter, the "density" function can be thought of as representing either variations in the average distances between stars, or the varying thickness of different parts of the disc.
Feeds |
Contact