General astronomy

General astronomy

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General astronomy

celestial sphere

Astronomy; General astronomy

An imaginary sphere of arbitrarily large radius, concentric with the observer, allowing observers to plot positions of objects in the sky when their distances are unknown or unimportant.

charge-coupled device (CCD)

Astronomy; General astronomy

A very sensitive electronic device that is revolutionizing astronomy in the 1990s. CCD cameras are composed of silicon chips that are sensitive to light, changing detected photons of light into ...

Antares

Astronomy; General astronomy

(alpha Sco, HR 6134) A red M1 Ib supergiant. It has a B3 V companion, which is a radio source.

1) A spiral galaxy (kS5 in Morgan's classification) in the Local Group, about 650-700 kpc distant (MV = -21), visible to the naked eye as a fuzzy patch in the constellation of Andromeda. Total mass ...

Andromeda II

Astronomy; General astronomy

Dwarf spheroidal galaxy in the Andromeda subgroup of the Local Group. It is among the intrinsically faintest members of the Local Group.

Andromeda III

Astronomy; General astronomy

Dwarf spheroidal galaxy in the Andromeda subgroup of the Local Group. It is among the intrinsically faintest members of the Local Group.

anomalous Zeeman effect

Astronomy; General astronomy

Zeeman effet in which spectral lines are split into several components, in contrast to the normal Zeeman effect which results in only two distinct components.