Galaxy

Galaxy

Relating to any large system of stars held together by mutual gravitation and isolated from similar systems by vast regions of space.

Industry: Astronomy

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Galaxy

angular diameter distance

Astronomy; Galaxy

Distance of a galaxy or any extended astronomical object estimated by comparing its physical size to the angle subtended in the sky.

luminosity function of galaxies

Astronomy; Galaxy

It is defined to be the space density of galaxies with intrinsic luminosities in the range L to L + dL.

Anti-electrons are like an electron but with a positive charge. Its dramatic property would be its pyrotechnic destruction by a conventional negatively charged electron, and the converse possibility ...

galactic globular cluster

Astronomy; Galaxy

Associations of 100,000 to a million stars which have extremely high stellar densities. These clusters are composed of stars that all have the same chemical composition and age. The stars all formed ...

galaxy density

Astronomy; Galaxy

It is defined as the number of galaxies (N=5) within this distance to the the volume of the sphere with the radius of the distance to the 5th nearest galaxy.