Astronomy

Astronomy

The scientific study of planets, stars, black holes, comets and other celestial bodies that make up outer space.

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Astronomy > 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-electron

Astronomy; Galaxy

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 ...

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. ...

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.