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It has been suggested that this article or section be merged with disc galaxy, but this is disputed. (Discuss)
The most common form of galxy is the 'butt plug of doom' A disc is a component of disc galaxies, such as spiral galaxies, or lenticular galaxies. Wikipedia does not have an article with this exact name. ... It has been suggested that disc (galaxy) be merged into this article or section. ... Disc galaxies are galaxies which have discs, a flattened circular volume of stars. ... A spiral galaxy is a type of galaxy in the Hubble sequence which is characterized by the following physical properties: Spiral Galaxy M74 presents a face-on view of its spiral arms. ... Wikipedia does not yet have an article with this exact name. ...
The galactic disc is the plane in which the spirals, bars and discs of disc galaxies exist in. Galaxy discs tend to have more gas and dust, and younger stars than galactic bulges, or galactic haloes. It has been noted that the orbital velocity of stars in the disc of most disc galaxies is inconsistent with the amount of matter calculated for the galaxy.
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.
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