9 relations: Disc galaxy, E (mathematical constant), Exponential function, Hydrogen line, Lenticular galaxy, Milky Way, Spiral galaxy, Stellar population, Tully–Fisher relation.

## Disc galaxy

A disc galaxy is a galaxy characterized by a disc, a flattened circular volume of stars.

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## E (mathematical constant)

The number is a mathematical constant, approximately equal to 2.71828, which appears in many different settings throughout mathematics.

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## Exponential function

In mathematics, an exponential function is a function of the form in which the argument occurs as an exponent.

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## Hydrogen line

The hydrogen line, 21-centimeter line or H I line refers to the electromagnetic radiation spectral line that is created by a change in the energy state of neutral hydrogen atoms.

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## Lenticular galaxy

A lenticular galaxy (denoted S0) is a type of galaxy intermediate between an elliptical (denoted E) and a spiral galaxy in galaxy morphological classification schemes.

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## Milky Way

The Milky Way is the galaxy that contains our Solar System.

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## Spiral galaxy

Spiral galaxies form a class of galaxy originally described by Edwin Hubble in his 1936 work The Realm of the Nebulae(pp. 124–151) and, as such, form part of the Hubble sequence.

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## Stellar population

During 1944, Walter Baade categorized groups of stars within the Milky Way into bluer stars associated with the spiral arms and the general position of yellow stars near the central galactic bulge or within globular star clusters.

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## Tully–Fisher relation

lenticular galaxies In astronomy, the Tully–Fisher relation (TFR) is an empirical relationship between the mass or intrinsic luminosity of a spiral galaxy and its angular velocity or emission line width.

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## Redirects here:

Disc (galaxy), Disk star, Galactic disc, Galactic disk, Galaxy disk, Stellar disk.