An Etymological Dictionary of Astronomy and Astrophysics

The largest and most luminous → globular cluster associated with the Milky Way Galaxy. Omega Centauri is located about 18,300 → light-years away and contains several million old stars. The stars in its center are so crowded that they are believed
to be only 0.1 light-year away from each other. It is about 12 billion years old. Omega Centauri was first listed in Ptolemy’s catalog nearly two thousand years ago. In 1677 Edmond Halley reported it as a nebula, and in the 1830s John Herschel was the first to correctly identify it as a globular cluster. Also called NGC 5139.

See also: Omega, Gk. alphabet letter; Centauri, → Centaurus.

The largest and most luminous → globular cluster associated with the Milky Way Galaxy. Omega Centauri is located about 18,300 → light-years away and contains several million old stars. The stars in its center are so crowded that they are believed
to be only 0.1 light-year away from each other. It is about 12 billion years old. Omega Centauri was first listed in Ptolemy’s catalog nearly two thousand years ago. In 1677 Edmond Halley reported it as a nebula, and in the 1830s John Herschel was the first to correctly identify it as a globular cluster. Also called NGC 5139.

See also: Omega, Gk. alphabet letter; Centauri, → Centaurus.

In the → solar dynamo model, the process whereby
the → meridional magnetic field is stretched into an → azimuthal magnetic field by → differential rotation. See also → alpha effect.

See also: Omega (ω), Gk. letter of alphabet; → effect.

In the → solar dynamo model, the process whereby
the → meridional magnetic field is stretched into an → azimuthal magnetic field by → differential rotation. See also → alpha effect.

See also: Omega (ω), Gk. letter of alphabet; → effect.

An → H II region located in the rich star fields of the → Sagittarius area of the Milky Way. Its distance from the Earth is between 5,000 and 6,000 → light-years and spans some 15 light-years in diameter. Its other designations are: Swan Nebula, Messier 17, and NGC 6618.

See also: Omega, Gk. alphabet letter; → nebula.

An → H II region located in the rich star fields of the → Sagittarius area of the Milky Way. Its distance from the Earth is between 5,000 and 6,000 → light-years and spans some 15 light-years in diameter. Its other designations are: Swan Nebula, Messier 17, and NGC 6618.

See also: Omega, Gk. alphabet letter; → nebula.

Another name for → Mira.

See also: Omicron, Gk. alphabet letter; Ceti, → Cetus.

Another name for → Mira.

See also: Omicron, Gk. alphabet letter; Ceti, → Cetus.

A bright star of → apparent visual magnitude  V = 4.3 lying in the constellation → Lupus. Among its other designations: HD 130807, HR 5528, HIP 72683. It is an → early-type star of → spectral type B5 IV and a member of the → Scorpius-Centaurus association. Ο Lupi is in fact a → binary system whose components have an angular separation of 0.043 arcsec, corresponding to a physical separation of 5.3 → astronomical units, with a mass ratio of 0.91.

See also: → Bayer designation; Lupi, genitive of → Lupus.

A bright star of → apparent visual magnitude  V = 4.3 lying in the constellation → Lupus. Among its other designations: HD 130807, HR 5528, HIP 72683. It is an → early-type star of → spectral type B5 IV and a member of the → Scorpius-Centaurus association. Ο Lupi is in fact a → binary system whose components have an angular separation of 0.043 arcsec, corresponding to a physical separation of 5.3 → astronomical units, with a mass ratio of 0.91.

See also: → Bayer designation; Lupi, genitive of → Lupus.

All, universally.

Etymology (EN): L. omni-, combining form of omnis “all, every,” of unknown origin.

Etymology (PE): Visp-, from Mid.Pers. visp- “all;” O.Pers. visa-, vispa- “all;” Av. vīspa- “all, every, entire, universal” (vīspô.ayāra- “lasting all the days,” vīspô.vīδvah- “knowing everything, omniscient”); cf. Skt. vīśva- “all, every; whole, universal.”

All, universally.

Etymology (EN): L. omni-, combining form of omnis “all, every,” of unknown origin.

Etymology (PE): Visp-, from Mid.Pers. visp- “all;” O.Pers. visa-, vispa- “all;” Av. vīspa- “all, every, entire, universal” (vīspô.ayāra- “lasting all the days,” vīspô.vīδvah- “knowing everything, omniscient”); cf. Skt. vīśva- “all, every; whole, universal.”

Having very great or unlimited power or authority.

See also: → omni-; → power.

Having very great or unlimited power or authority.

See also: → omni-; → power.

Same as → ubiquitous.

See also: → omni-; → present.

Same as → ubiquitous.

See also: → omni-; → present.

Having infinite knowledge, awareness, understanding, or insight.

Etymology (EN): → omni-; L. scient “knowing,”
→ science.

Etymology (PE): Visp-, → omni-, dânâ “knowing, learned,” → science; âgâh “aware,” → look.

Having infinite knowledge, awareness, understanding, or insight.

Etymology (EN): → omni-; L. scient “knowing,”
→ science.

Etymology (PE): Visp-, → omni-, dânâ “knowing, learned,” → science; âgâh “aware,” → look.