Disc

Disc or disk (computing and American English) may refer to:

Data storage

Disc (galaxy)

A disc is a component of disc galaxies, such as spiral galaxies, or lenticular galaxies.

The galactic disc is the plane in which the spirals, bars and discs of disc galaxies exist. Galactic discs tend to have more gas and dust and younger stars than galactic bulges or galactic haloes.

The galactic disc is mainly composed of gas, dust and stars. The gas and dust component of the galactic disc is called the gaseous disc. The star component of the galactic disc is called the stellar disc.

Inconsistent orbital velocities of stars

It has been noted that the orbital velocity of stars in the disc of most disc galaxies is inconsistent with the amount of luminous matter calculated for the galaxy. A possible explanation for this problem is the non-luminous dark matter.

See also

Further reading

Disk (mathematics)

In geometry, a disk (also spelled disc) is the region in a plane bounded by a circle. A disk is said to be closed or open according to whether it contains the circle that constitutes its boundary.

Formulas

In Cartesian coordinates, the open disk of center and radius R is given by the formula

while the closed disk of the same center and radius is given by

The area of a closed or open disk of radius R is πR² (see area of a disk).

Properties

The disk has circular symmetry.

The open disk and the closed disk are not topologically equivalent (that is, they are not homeomorphic), as they have different topological properties from each other. For instance, every closed disk is compact whereas every open disk is not compact. However from the viewpoint of algebraic topology they share many properties: both of them are contractible and so are homotopy equivalent to a single point. This implies that their fundamental groups are trivial, and all homology groups are trivial except the 0th one, which is isomorphic to Z. The Euler characteristic of a point (and therefore also that of a closed or open disk) is 1.

Relax

Relax may refer to:

Music

Albums

Songs

Film

Computing

See also

Shanti Shanti Shanti

Shanti Shanti Shanti is a 1998 Kannada language comedy film directed by Srinivas. The film starred Abbas, Madhavan, Prakash Raj, Prema, Avni and Satish Shah in leading roles. The film during production became known for its series of innovative ideas for the Kannada film industry, by becoming the first film to have a website and a six-track DTS sound. The film, which featured cinematography from P. C. Sriram, released on 20 November 1998.

After the success of Madhavan's Alaipayuthey, the film was dubbed into the Tamil language as Relax to cash in on his newfound following.

Plot

There is Murthy, the rich but frugal papa, and his two college-going kids, Siddhartha (Madhavan) and Shanti (Avni). Given papa's ways, the two kids feel a bit shackled, and yearn constantly for the good life. Matters come to a head when Siddharth wants to play the guitar at a college function, Shanti wants to take part in the fashion parade—both need money and, of course, papa isn't in the mood to indulge such extravagance.

Relax (Blank & Jones album)

Relax is the fifth studio album by Trance duo Blank & Jones. It was released in 2003.

Track listing

Relax (2007 Reissue) Soundcolors #SC101, Double CD, Limited Edition, released in 2007.

Track listing

CD1 - Sun